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In a velocity selector, electric field E and magnetic field B are perpendicular. Velocity of particles passing undeflected:
AE/B
BB/E
CEB
DE²/B
Answer & Solution
Correct answer: A. E/B
For undeflected motion: electric force qE balances magnetic force qvB. So v = E/B. Only particles with this specific speed pass straight; others are deflected. Used in mass spectrometers.
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