A torque of 2.5 Nm acts on a current carrying rectangular coil of area `0.2 m^(2)`, suspended vertically in a uniform magnetic field. What is the torque, if the rectangular coil is replaced by a plane circular coil of the same area? [all other quantities are unaltered]

Options

A. `2.5 Nm`
B. `1.5 Nm`
C. ` 3 Nm`
D. `5 Nm`

Answer

A

Explanation

No change. As long as the area remains constant the torque is independent of the shape of the coil.