alleryIn 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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