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A dipole of moment 3 A m² is aligned along a 0.2 T field. Its potential energy is
A+0.6 J
B–1.5 J
Czero
D–0.6 J
Answer & Solution
Correct answer: D. –0.6 J
Potential energy is minus m B cos theta, and with theta zero this gives minus 3 times 0.2, so minus 0.6 J.
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