Physics

Problem

A small bar magnet placed with its axis at

30^\circ

with an external field of

0.06 \text{ T}

experiences a torque of

0.018 \text{ Nm}

. The minimum work required to rotate it from its stable to unstable equilibrium position is : a.

6.4 \times 10^{-2} \text{ J}

9.2 \times 10^{-3} \text{ J}

7.2 \times 10^{-2} \text{ J}

11.7 \times 10^{-3} \text{ J}