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Asked by Srinivasan Last Modified
Answer 
Varun Sharma
Consider a region where a charge q is moving with a speed v. E and B are the Electric and Magnetic fields. v, E and B are perpendicular to each other.
If we want to select a particle of velocity v so it must pass undeflected. This means that electric and magnetic forces acting on it are equal and opposite.
Electrostatic force = qE
Magnetic force =qvB
qE=qvB
=> v = E/B
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