8/14/2019 Section 16.2 Magnetic Effect of Electric Current
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Section 16.2Section 16.2
Magnetic effect ofMagnetic effect of
electric currentelectric current
Section 16.2Section 16.2
Magnetic effect ofMagnetic effect of
electric currentelectric current
Current-carrying circular coilCurrent-carrying circular coil
Current-carrying straight wireCurrent-carrying straight wire
Current-carrying solenoidCurrent-carrying solenoid
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Magnetic effect of electric current
Magnetic field produced by magnet
16.2 Magnetic effect of electric current (SB p. 111)
Go to
Discussion 2Discussion 2
moving electric charges
electric current
magnetic effect of an electric current
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Magnetic field
concentric circles with wire
at centre
Current-carrying straight wire
16.2 Magnetic effect of electric current (SB p. 112)
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currentoutoftheplane
Current-carrying straight wire
16.2 Magnetic effect of electric current (SB p. 113)
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currentintotheplane
Current-carrying straight wire
16.2 Magnetic effect of electric current (SB p. 113)
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magnetic field predicted by
right hand
field lines
current
Right-hand grip rule for current-carrying
straight wire
16.2 Magnetic effect of electric current (SB p. 113)
right-hand grip rule
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right hand
field lines
current
Right-hand grip rule for current-carrying
straight wire
16.2 Magnetic effect of electric current (SB p. 113)
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right hand
field lines
current
Right-hand grip rule for current-carrying
straight wire
16.2 Magnetic effect of electric current (SB p. 113)
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Current-carrying circular coil
Expt. 16B
Magnetic effect
of current
B. Magnetic
field due tocurrent-carrying
circular coil
16.2 Magnetic effect of electric current (SB p. 114)
circular coil
d.c. power supply
plastic board
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Current-carrying circular coil
16.2 Magnetic effect of electric current (SB p. 114)
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Magnetic field
points upwards
Magnetic field points
into paper
Right-hand grip rule for current-carrying
circular coil
16.2 Magnetic effect of electric current (SB p. 115)
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Current-carrying solenoid
Expt. 16B
Magnetic effect
of current
C. Magnetic
field due tocurrent-carrying
solenoid
16.2 Magnetic effect of electric current (SB p. 115)
solenoid
d.c. power supplyplastic board
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uniform
Current-carrying solenoid
16.2 Magnetic effect of electric current (SB p. 115)
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Right-hand grip rule for current-carrying
solenoid
16.2 Magnetic effect of electric current (SB p. 116)
Thinking 4Thinking 4
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Example 1:Example 1:The following figure shows a solenoid placed on a table. If
two compasses are placed at Xand Yon the table, drawthe needles of the compasses when
(a) switch K is open, and
(b) switch K is closed.
(The needles of the compasses point to the north.)
Solution
16.2 Magnetic effect of electric current (SB p. 117)
(a)
(b)
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To section 16.3
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Discussion 2:Discussion 2:
1. With the help of a magnet, suggest a methodto make an iron bar attract some paper clips.
Discuss with your classmates. Answer
16.2 Magnetic effect of electric current (SB p. 111)
(a) Touch the iron bar with the magnet, and then the
iron bar can attract the paper clips.
(b) Magnetize the iron bar by sliding the north pole of
the magnet along the bar many times in the same
direction. Then the iron bar can attract the paper
clips.
S N
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Discussion 2: (Cont)Discussion 2: (Cont)
2. A compass is wound with several turns of awire. The wire is connected to a dry cell to
form a closed circuit. What happens to the
needle of the compass?
Discuss with your classmates.
The needle is deflected.
Return to
TextText
16.2 Magnetic effect of electric current (SB p. 111)
Ans
wer
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The diagram shows two long and parallelcurrent-carrying wires. Point Q is at equal
distance from the two wires. Find the direction of
the resulting magnetic fields at pointP
,Q
andR
.
Thinking 4Thinking 4
Ans
wer
Return to
TextText
At Q, the magnetic field by I1
is pointing out of the paper,
but the magnetic field by I2 ispointing in of the paper.
Therefore, there is no magnetic
field at Q.
16.2 Magnetic effect of electric current (SB p. 116)
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