Physics · JEE | Magnetism and Matter

A bar magnet of magnetic moment \( 1.5\text{ J T}^{-1} \) lies aligned with the direction of a uniform magnetic field of \( 0.22\text{ T} \). What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment normal to the field direction?

1. A
   \( 0.11\text{ J} \)
2. B
   \( 0.22\text{ J} \)
3. C
   \( 0.66\text{ J} \)
4. D
   \( 0.33\text{ J} \)