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

Answer

B

Explanation

The torque on the coil in a magnetic field is given by `tau=nIBA cos theta`. For radial field, the coil is set with its plane parallel to the direction of the magnetic field `B`, then `theta=0^(@)` and `cos theta=1implies ` Torque `=nIBA(1)=nIBA` (maximum).