A magnet of total magnetic moment 10⁻² … A-m² is placed in a time varying magnetic field, B… (cos …) where B = 1 Tesla and … = 0.125 rad/s. The work done for reversing the direction of the magnetic moment at t = 1 second, is -

Option A. To determine the work done in reversing the direction of a magnetic moment in a time-varying magnetic field, we'll follow these steps:

Magnetic Properties of Matter

JEE Main 2019 · 10 Jan, Morning shift · Q7612

PhysicsHard49×since 2003Q7612

A magnet of total magnetic moment 10⁻²

{\widehat i}

A-m² is placed in a time varying magnetic field, B

{\widehat i}

(cos

\omega t

) where B = 1 Tesla and

\omega

= 0.125 rad/s. The work done for reversing the direction of the magnetic moment at t = 1 second, is -