A thin spherical shell carries uniformly distributed positive charge and rotates with angular velocity ω about a diameter. What is the direction of its net magnetic moment?
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Question

A thin spherical shell carries uniformly distributed positive charge and rotates with angular velocity ω about a diameter. What is the direction of its net magnetic moment?

G1 Physics · Accepted Answer

Positive rotating charge produces conventional surface current in the direction of rotation, so the net magnetic moment is parallel to ω.