1. Tardigrade
  2. Question
  3. Physics
  4. A bar magnet with a magnetic moment 5.0 Am 2 is placed in parallel position relative to a magnetic field of 0.4 T. The amount of required work done in turning the magnet from parallel to antiparallel position relative to the field direction is

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. A bar magnet with a magnetic moment $5.0\, Am ^2$ is placed in parallel position relative to a magnetic field of $0.4\, T$. The amount of required work done in turning the magnet from parallel to antiparallel position relative to the field direction is

JEE MainJEE Main 2023Magnetism and Matter

Solution:

$ u=-M B \cos \theta $
$ W=\Delta u $
$ W=-M B \cos 180^{\circ}\left(-m B \cos 0^{\circ}\right) $
$ W=2 M B=2 \times 5 \times 0.4=4\, J$