Question

# Assertion :The net magnetic force on a current loop in a uniform magnetic field is zero but torque may or may not be zero. Reason: Torque on a current carrying coil in a magnetic field is given by $$\bar \tau= nI(\bar A X \bar B).$$

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C
Assertion is correct but Reason is incorrect
D
Both Assertion and Reason are incorrect

Solution

## The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for AssertionSince the net torque acting on a current carrying coil is given by:$$\tau=nI(\vec A\times \vec B)$$where, $$\vec A$$ is the area of cross-section through which the magnetic field $$\vec B$$ passes.The net force acting on the coil might be zero but it can produce a torque on the coil if it acts in the opposite direction.Here, assertion and reason both are correct but reason is not the correct explanation of assertion.Physics

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