A Rigid Circular Loop Has a Radius of 0

question 1

Multiple Choice

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 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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