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A magnetic dipole of magnetic moment $M = 0.5 \text{ A m}^2$ is placed in a magnetic field $B = 0.4 \text{ T}$. The work done $W$ in rotating the dipole from $\theta_1 = 0^\circ$ to $\theta_2 = 90^\circ$ is:
- A.$0.1 \text{ J}$
- B.$0.2 \text{ J}$
- C.$0.4 \text{ J}$
- D.$0.05 \text{ J}$
Show correct answer & step-by-step solution
Correct answer: B — $0.2 \text{ J}$
Solution
The work done in rotating a magnetic dipole is . Substituting the values, .
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