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Q.

Three plotting compasses are placed close to a solenoid carrying current. How many of the compass needles will change direction, if the current through the solenoid is increased? (Ignore the effect of the earth's magnetic field)


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a

Only 1 compass needle

b

2 compass needles

c

3 compass needles

d

None of these 

answer is D.

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Detailed Solution

Three plotting compasses are placed close to a solenoid carrying current. None of the compass needles will change direction if the current through the solenoid is increased.
The compass needle will not change its direction as there will be a uniform(constant) magnetic field around a solenoid. So, no activity is shown by the compass needle.
 
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