tem 2 Part A A magnetic dipole with moment 1.49 A m2 is placed in a uniform exte

Question

tem 2 Part A A magnetic dipole with moment 1.49 A m2 is placed in a uniform external field of strength 0.830 As was the case with electric dipoles, when a magnetic dipole rotates, there is a change in potential energy. For a review, see the Hints Suppose the dipole is initially placed in it's maximum potential energy orientation (anti-aligned with the external field) and then it rotates to its minimum energy orientation (aligned with the external field) What was the change in potential energy? Note: this is what happens in an MRI machine! Express your answer in joules Hints Submit My Answers Give Up Provide Feedback Continue

Explanation / Answer

M = 1.49 A.m2, B = 0.830 T

W1 = -M B cos 180 = M B = 1.49 * 0.830 = 1.236 J

W2 = -M B cos 0 = -M B = -1.49 * 0.830 = -1.236 J

change in potential energy = W2 - W1

= -1.24 - 1.24

change in potential energy = -2.47 J

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