A magnet of total magnetic moment is placed in a time varying magnetic field

PHYSICS · Single correct · CBSE · Physics · Magnetism and Matter · Magnetism and Matter

Problem

A magnet of total magnetic moment

10^{-2} \hat{i} \text{ A-m}^2

is placed in a time varying magnetic field,

B \hat{i} (\cos \omega t)

where

B = 1 \text{ Tesla}

and

\omega = 0.125 \text{ rad/s}

. The work done for reversing the direction of the magnetic moment at

t = 1

second, is: (1)

0.01 \text{ J}

(2)

0.007 \text{ J}

(3)

0.028 \text{ J}

(4)

0.014 \text{ J}