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The Circular Motion

An electron i...

Question

An electron is ejected from the surface of a long, thick straight conductor carrying a current, initially in a direction perpendicular to the conductor. The electron will

A

ultimately return to the conductor

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B

move in a circular path around the conductor

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C

gradually move away from the conductor along a spiral

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D

move in a helical path, with the conductor as the axis

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Solution

The correct option is A ultimately return to the conductor
The initial force on the electron is downward.
As the electron changes direction, the force on it remains in the xy-plane, with a component directed toward the conductor

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