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A dipole of moment 3 A m^2 is turned from the stable to the unstable position in a 0.2 T field. The energy needed is
A0.6 J
B2.4 J
C1.2 J
D0.3 J
Answer & Solution
Correct answer: C. 1.2 J
Energy change = (+mB) - (-mB) = 2mB = 2 x 3 x 0.2 = 1.2 J.
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