NEET Physics Question - Magnetic Effects of Current

Assertion (A): When a straight wire carrying current is placed along the axis of a current carrying ring, it starts rotating about the wire.

Reason (R): Charged ring will experience a torque when current carrying cable will pass through its axis.

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Solution:

Assertion (A) is false. A straight wire carrying current along the axis of a ring produces a magnetic field that is perpendicular to the current elements of the ring. Consequently, the magnetic force \(I(\vec{dl} \times \vec{B}))\ on each element is zero, resulting in no net force or torque on the ring.

Reason (R) is also false because no torque is experienced under these conditions. Both assertion and reason are false.

Rankers Physics

Torque on Current Carrying Ring

Solution:

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