Physics-Magnetic Force on Current

NEET Physics Magnetic Force on Current Assertion Reason Question

Type: Assertion Reason-assertion-Hard-Class 12

Assertion (A): The magnetic force on a current-carrying wire is zero when the wire is aligned parallel to the external magnetic field. | Reason (R): The magnetic force depends on the cross product of current direction and magnetic field, which is zero when both are parallel.

A

Both A and R are true, and R is the correct explanation of A.

B

Both A and R are true, but R is not the correct explanation of A.

C

A is true but R is false.

D

A is false.

Correct Answer

Option A

Detailed Explanation

The force on a current-carrying wire is given by F = I(l × B). When the wire is parallel to B, the angle θ between them is 0, making the cross product and thus the force zero.

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