1. Tardigrade
  2. Question
  3. Physics
  4. A bar magnet is placed in the position of stable equilibrium in a uniform magnetic field of induction B. If it is rotated through an angle if 90°, then the work is (M= magnetic dipole moment of bar magnet )

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. A bar magnet is placed in the position of stable equilibrium in a uniform magnetic field of induction $B$. If it is rotated through an angle if $90^{\circ},$ then the work is $(M=$ magnetic dipole moment of bar magnet $)$

Magnetism and Matter

Solution:

Work done, $W=M B\left(\cos \theta_{1}-\cos \theta_{2}\right)$
Then, $W=M B\left(\cos 0^{\circ}-\cos 90^{\circ}\right)=M B$