Potential Energy of a Current Loop: a Rigid Circular Loop

question 59

Multiple Choice

Potential energy of a current loop: A rigid circular loop has a radius of 0.20 m and is in the xy-plane. A clockwise current I is carried by the loop, as shown. The magnitude of the magnetic moment of the loop is 0.75 A ∙ m². A uniform external magnetic field, B = 0.20 T in the positive x-direction, is present. An external torque changes the orientation of the loop from one of lowest potential energy to one of highest potential energy. The work done by this external torque is closest to

• A) 0.20 J
• B) 0.30 J
• C) 0.40 J
• D) 0.50 J
• E) 0.60 J

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