Is relative motion between a conductor and a magnetic field required to produce current flow?

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Multiple Choice

Is relative motion between a conductor and a magnetic field required to produce current flow?

Explanation:
Moving a conductor through a magnetic field makes charges inside it feel a magnetic force (the Lorentz force, q(v × B)). This pushes charges to one end of the conductor, creating a potential difference along its length. If the circuit is closed, that electromotive force drives current. In the common scenario used for practice problems, motion relative to the field is what starts the current flow. There is another way to induce current—changing the magnetic flux through a stationary loop can generate emf without the conductor moving—but that’s a different induction situation. For the typical case described, relative motion between the conductor and the magnetic field is what produces current.

Moving a conductor through a magnetic field makes charges inside it feel a magnetic force (the Lorentz force, q(v × B)). This pushes charges to one end of the conductor, creating a potential difference along its length. If the circuit is closed, that electromotive force drives current. In the common scenario used for practice problems, motion relative to the field is what starts the current flow.

There is another way to induce current—changing the magnetic flux through a stationary loop can generate emf without the conductor moving—but that’s a different induction situation. For the typical case described, relative motion between the conductor and the magnetic field is what produces current.

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