Consider a wire carrying a steady current I placed in a uniform magnetic field B perpendicular to its length. Since magnetic forces do no work on isolated moving charges, what does this imply for the wire?

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Physics · Moving Charges and Magnetism

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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Some charges inside the wire move to the surface as a result of B, establishing an electric field that does work.

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Answer 1

The magnetic force acts only on the fixed positive ions within the wire.

Answer 2

If the wire moves under the influence of B, no macroscopic mechanical work is done.

Answer 3

Some charges inside the wire move to the surface as a result of B, establishing an electric field that does work.

Answer 4

The motion of charges inside the conductor is entirely unaffected by B.

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