Assertion: Torque on the coil is the maximum, when coil is suspended in a radial magentic field.
Reason: The torque tends to rotates the coil on its own axis.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion
C. If assertion is true but reason is false.
D. If the assertion and reason both are false.

Answer

B

Explanation

The torque on the coil in a magnetic field is given by `tau = nlBA cos theta`
For radial field, the coil is set with its plane parallel to the direction of the magnetic field B, then `theta` = 00 and `cos theta = 1 implies` Torque = n lBA(1) = nlBA (maximum)