A small bar magnet placed with its axis at with an external field of experiences a…

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Magnetism and Electromagnetism · Magnetism and Electromagnetism

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 : (1)

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

(2)

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

(3)

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

(4)

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