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An electron of charge e and mass m moves through a uniform electric field of magnitude E (ignore gravity). The magnitude of its acceleration is:

1. e²/m
2. E²*e/m
3. eE/m
4. mE/e

Correct answer: eE/m

Solution

The electric force on the electron is F = eE, and by Newton's second law a = F/m = eE/m.

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