Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.
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Transcript of Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.
![Page 1: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/1.jpg)
Electro-Magnetism
© David Hoult 2009
![Page 2: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/2.jpg)
Magnetic Field Shapes
© David Hoult 2009
![Page 3: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/3.jpg)
Magnetic fields are represented by lines called lines of magnetic force or lines of magnetic flux
© David Hoult 2009
![Page 4: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/4.jpg)
Magnetic fields are represented by lines called lines of magnetic force or lines of magnetic flux
These lines show the direction of the force which would act on a free north magnetic pole placed in the field
© David Hoult 2009
![Page 5: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/5.jpg)
Magnetic fields are represented by lines called lines of magnetic force or lines of magnetic flux
These lines show the direction of the force which would act on a free north magnetic pole placed in the field
However, since free north magnetic poles don’t exist... think of the lines as showing which way a very small compass would point if placed in the field
© David Hoult 2009
![Page 6: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/6.jpg)
Magnetic fields are represented by lines called lines of magnetic force or lines of magnetic flux
These lines show the direction of the force which would act on a free north magnetic pole placed in the field
However, since free north magnetic poles don’t exist... think of the lines as showing which way a very small compass would point if placed n the field
The “density” of lines on a diagram indicates the strength of the magnetic field
© David Hoult 2009
![Page 7: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/7.jpg)
Field due to a straight current-carrying conductor
© David Hoult 2009
![Page 8: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/8.jpg)
Field due to a straight current-carrying conductor
© David Hoult 2009
![Page 9: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/9.jpg)
It is found that a compass always points perpendicular to the conductor so we conclude that the lines form circles (or cylinders) round the conductor
© David Hoult 2009
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To remember the sense of the magnetic field, think about
© David Hoult 2009
![Page 11: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/11.jpg)
To remember the sense of the magnetic field, think about opening a bottle of wine.
© David Hoult 2009
![Page 12: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/12.jpg)
To remember the sense of the magnetic field, think about opening a bottle of wine.
© David Hoult 2009
![Page 13: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/13.jpg)
To remember the sense of the magnetic field, think about opening a bottle of wine.
demo... © David Hoult 2009
![Page 14: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/14.jpg)
To remember the sense of the magnetic field, think about opening a bottle of wine.
© David Hoult 2009
![Page 15: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/15.jpg)
Field due to a short current-carrying coil of wire
© David Hoult 2009
![Page 16: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/16.jpg)
Field due to a short current-carrying coil of wire
© David Hoult 2009
![Page 17: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/17.jpg)
Field due to a short current-carrying coil of wire
© David Hoult 2009
![Page 18: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/18.jpg)
Field due to a long current-carrying coil of wire (also called a solenoid)
© David Hoult 2009
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Field due to a long current-carrying coil of wire (also called a solenoid)
© David Hoult 2009
![Page 20: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/20.jpg)
Field due to a long current-carrying coil of wire (also called a solenoid)
© David Hoult 2009
![Page 21: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/21.jpg)
This field is similar to that of a bar magnet
© David Hoult 2009
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This field is similar to that of a bar magnet
© David Hoult 2009
![Page 23: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/23.jpg)
This field is similar to that of a bar magnet
© David Hoult 2009
![Page 24: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/24.jpg)
This field is similar to that of a bar magnet
© David Hoult 2009
![Page 25: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/25.jpg)
This field is similar to that of a bar magnet
© David Hoult 2009
![Page 26: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/26.jpg)
Current into plane of diagram
© David Hoult 2009
![Page 27: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/27.jpg)
Current into plane of diagram
Current out of plane of diagram
© David Hoult 2009
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Fields due to two parallel current-carrying conductors
© David Hoult 2009
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Fields due to two parallel current-carrying conductors Currents flowing in the same sense
© David Hoult 2009
![Page 30: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/30.jpg)
Fields due to two parallel current-carrying conductors Currents flowing in the same sense
© David Hoult 2009
![Page 31: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/31.jpg)
Fields due to two parallel current-carrying conductors Currents flowing in the same sense
© David Hoult 2009
![Page 32: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/32.jpg)
Fields due to two parallel current-carrying conductors Currents flowing in the same sense
© David Hoult 2009
![Page 33: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/33.jpg)
Fields due to two parallel current-carrying conductors Currents flowing in the same sense
© David Hoult 2009
![Page 34: Electro-Magnetism © David Hoult 2009. Magnetic Field Shapes © David Hoult 2009.](https://reader035.fdocuments.us/reader035/viewer/2022062300/56649e0e5503460f94af89c4/html5/thumbnails/34.jpg)
Fields due to two parallel current-carrying conductors Currents flowing in the same sense
The two conductors attract each other© David Hoult 2009
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Currents flowing in opposite sense
© David Hoult 2009
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Close to the conductors the field is very nearly circular
© David Hoult 2009
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© David Hoult 2009
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The field is similar in shape to the field of a
© David Hoult 2009
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The field is similar in shape to the field of a short coil
© David Hoult 2009
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The field is similar in shape to the field of a short coil
The two conductors repel each other
© David Hoult 2009