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Q.

The force exerted on a current carrying wire placed in a magnetic field is zero when the angle between the wire and the direction of the magnetic field is:

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a

45°

b

60°

c

90°

d

180°

answer is D.

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Detailed Solution

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  • When there is an external magnetic field present, a current-carrying wire experiences a force. 
  • When L is the wire's length, I is current and θ is the angle between the current's direction and the magnetic field, it is discovered that F = BIL sinθ.
  • Since the sine of 180 degrees is zero, there is no force applied to a current-carrying wire in a magnetic field when the angle between the wire and the magnetic field's direction is 180 degrees.
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