More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field...
Transcript of More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field...
![Page 2: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/2.jpg)
Magnets have been known for centuries.Magnets have been known for centuries.The Chinese and Greeks knew about the The Chinese and Greeks knew about the “magical” properties of magnets. The “magical” properties of magnets. The ancient Greeks used a stone substance ancient Greeks used a stone substance called “magnetite.” They discovered that the called “magnetite.” They discovered that the stone always pointed in the same direction. stone always pointed in the same direction. Later, stones of magnetite called Later, stones of magnetite called “lodestones” were used in navigation.“lodestones” were used in navigation.
![Page 3: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/3.jpg)
William Gilbert, an English physician, first proposed in 1600 that the earth itself is a magnet, and he predicted that the Earth would be found to have magnetic poles.
![Page 4: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/4.jpg)
What is Magnetism?What is Magnetism?
Magnetism is the force of attraction or repulsion of a magnetic material due to the arrangement of its atoms, particularly its electrons.
![Page 5: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/5.jpg)
All magnetic phenomena result from
forces between electric charges in
motion.
![Page 6: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/6.jpg)
The ends of a magnet are where the magnetic effect is the strongest. These are called “poles.” Each magnet has2 poles – 1 north, 1 south.
![Page 7: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/7.jpg)
Like repels Like repels like…like…
Opposites attract!Opposites attract!
![Page 8: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/8.jpg)
Poles of a magnet always
Come in pairs!
![Page 9: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/9.jpg)
If you cut a magnet in half,If you cut a magnet in half,
you get 2 magnets!you get 2 magnets!
S N S N S N
![Page 10: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/10.jpg)
No Monopoles Allowed
It has not been shown to be possible to end up with a single North pole or a single South pole, which is a monopole ("mono" means one or single, thus one pole).
Note: Some theorists believe that magnetic monopoles may have been made in the early Universe. So far, none have been detected.
S N
![Page 11: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/11.jpg)
Magnetic Magnetic FieldsFields
The region where the magnetic forcesThe region where the magnetic forcesact is called the “magnetic field”act is called the “magnetic field”
![Page 12: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/12.jpg)
Defining Magnetic Field Direction
Magnetic Field vectors as written as B
Direction of magnetic field at any point is defined as the direction of motion of a charged particle on which the magnetic field would not exert a force.
Magnitude of the B-vector is proportional to the force acting on the moving charge, magnitude of the moving charge, the magnitude of its velocity, and the angle between v and the B-field. Unit is the Tesla or the Gauss (1 T = 10,000 G).
![Page 13: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/13.jpg)
![Page 14: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/14.jpg)
Field Lines Around a Bar Magnet
![Page 15: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/15.jpg)
Field Lines Around a Magnetic Sphere
![Page 16: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/16.jpg)
Field Lines of Repelling Bars
![Page 17: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/17.jpg)
Field Lines of Attracting Bars
![Page 18: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/18.jpg)
Atoms themselves have magnetic properties due to the spin of the atom’s electrons.
These areas of atoms are called “domains”
Groups of atoms join so that their magnetic fields are all going in the same direction
![Page 19: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/19.jpg)
When an unmagnetized substance is placed in a magneticWhen an unmagnetized substance is placed in a magneticfield, the substance can become magnetized.field, the substance can become magnetized.
This happens when the spinning electrons line up in theThis happens when the spinning electrons line up in thesame direction.same direction.
![Page 20: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/20.jpg)
An unmagnetized substance An unmagnetized substance looks like this…looks like this…
![Page 21: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/21.jpg)
While a magnetized substance looksWhile a magnetized substance lookslike this…like this…
Iron
Lodestone (Magnetite)
![Page 22: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/22.jpg)
How to break a magnet:
1. Drop it
2. Heat itThis causes the domains to become random again!
![Page 23: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/23.jpg)
Making and Breaking Magnets
In most materials, if you add energy to the electrons, you can get them to move and realign
Can you think of ways to add energy to electrons? How can you make a magnet? How can you demagnetize a magnet? What happens when you break a magnet?
![Page 24: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/24.jpg)
N
S
Magnetic Field Vectors Due to a Bar Magnet
![Page 25: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/25.jpg)
N
S
![Page 26: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/26.jpg)
N
S
![Page 27: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/27.jpg)
N
S
![Page 28: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/28.jpg)
N
S
![Page 29: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/29.jpg)
N
S
![Page 30: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/30.jpg)
N
S
![Page 31: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/31.jpg)
N
S
![Page 32: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/32.jpg)
N
S
![Page 33: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/33.jpg)
N
S
![Page 34: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/34.jpg)
Magnetic Field Lines
• The direction of the magnetic field at any point is tangent to the magnetic field line at that point.
![Page 35: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/35.jpg)
N
S
![Page 36: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/36.jpg)
![Page 37: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/37.jpg)
Vocabulary for ELL
• Magnet: material that can both attract and Magnet: material that can both attract and repel other magnets. Iron is most common.repel other magnets. Iron is most common.
• Pole: Part of the magnet where the force is Pole: Part of the magnet where the force is the strongestthe strongest
• Metal: material that is often attracted to Metal: material that is often attracted to magnets and a good electrical conductormagnets and a good electrical conductor
• Horseshoe magnet: Horseshoe magnet: • U-shaped magnetU-shaped magnet
NS
![Page 38: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/38.jpg)
The Earth is a magnet:The Earth is a magnet:It exerts magnetic forces and is surrounded by amagnetic field that is strongest near theNorth and South magnetic poles
![Page 39: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/39.jpg)
Sometimes, Sometimes, the Earth’s the Earth’s magnetic magnetic poles flip. poles flip. This happens This happens every half-every half-million years million years or so.or so.
Magnetic North Pole
Magnetic South Pole
![Page 40: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/40.jpg)
We use the Earth’s magnetic field to find direction.
The needle of a compass always points toward the magnetic south pole.
We call this direction “North” (remember, opposites attract)
![Page 41: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/41.jpg)
Vocabulary for ELL� Geographic North pole: the north end of the Geographic North pole: the north end of the
axis around which the Earth rotatesaxis around which the Earth rotates
� Magnetic North pole: the point on the Earth Magnetic North pole: the point on the Earth to which a compass needle pointsto which a compass needle points
![Page 42: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/42.jpg)
The sun has a magnetic field, too. The sun has a magnetic field, too. It extends far above the sun’s It extends far above the sun’s surface.surface.
Other planets in the solar Other planets in the solar system also have these system also have these magnetic fieldsmagnetic fields
![Page 43: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/43.jpg)
![Page 44: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/44.jpg)
When a charged particle enters a When a charged particle enters a magnetic field, an electric force is magnetic field, an electric force is exerted on it. If a charged particle exerted on it. If a charged particle moves at an angle to a magnetic field, moves at an angle to a magnetic field, the magnetic force acting on it will the magnetic force acting on it will cause it to move in a spiral around the cause it to move in a spiral around the magnetic field linesmagnetic field lines..
![Page 45: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/45.jpg)
The solar wind is constantly bombarding the Earth’s magnetic field. Sometimes these charged particles penetrate that field. These particles are found in two large regions known as the Van Allen Belts.
![Page 46: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/46.jpg)
The Earth’s magnetic f ield extends far into space. It is cal led the “magnetosphere.”
When the magnetic particles from the sun, cal led “solar wind”, strike this magnetosphere, we see a phenomenon cal led…
![Page 47: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/47.jpg)
The Aurora Borealis in the Northern HemisphereThe Aurora Borealis in the Northern Hemisphere
And the Aurora Australis in the Southern HemisphereAnd the Aurora Australis in the Southern Hemisphere
![Page 48: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/48.jpg)
![Page 49: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/49.jpg)
Electricity and Magnetism Electric forces hold atoms and molecules together. Electricity controls our thinking, feeling, muscles and metabolic processes. Electricity and magnetism underpin much of our current technology (e.g. computers). Electricity and magnetism are linked on a fundamental level.
![Page 50: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/50.jpg)
Electric MotorAn electric motor, is a machine which converts electrical energy into mechanical (rotational or kinetic) energy.
A current is passed through a loop which is immersed in a magnetic field. A force exists on the top leg of the loop which pulls the loop out of the paper, while a force on the bottom leg of the loop pushes the loop into the paper.
The net effect of these forces is to rotate the loop.
![Page 51: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/51.jpg)
Electromagnet (Magnetism from Electricity)
An electromagnet is simply a coil of wires which, when a current is passed through, generate a magnetic field, as below.
![Page 52: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/52.jpg)
Magnetic Properties of Matter
In other words….materials which produce magnetic fields with no apparent circulation of charge.
All substances - solid, gas, and liquid - react to the presence of a magnetic field on some level. Remember why?
How much they react causes them to be put into several material “types”.
![Page 53: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/53.jpg)
Top Ten List
1. There are North Poles and South Poles.
2. Like poles repel, unlike poles attract.
3. Magnetic forces attract only magnetic materials.
4. Magnetic forces act at a distance.
5. While magnetized, temporary magnets act like permanent magnets.
What We Will Learn About Magnetism
![Page 54: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/54.jpg)
Top Ten Continued
9. A charged particle experiences no magnetic force when moving parallel to a magnetic field, but when it is moving perpendicular to the field it experiences a force perpendicular to both the field and the direction of motion.
10. A current-carrying wire in a perpendicular magnetic field experiences a force in a direction perpendicular to both the wire and the field.
![Page 55: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/55.jpg)
![Page 56: More free powerpoints at :// UNIT V PPT I...Unit is the Tesla or the Gauss (1 T = 10,000 G). Field Lines Around a Bar Magnet. Field Lines Around a Magnetic Sphere. Field Lines of Repelling](https://reader036.fdocuments.us/reader036/viewer/2022070213/610a5424257d322a796c0558/html5/thumbnails/56.jpg)
Let’s Play!