Question

Force on a charge due to electric field given by Fe=qE and force due to magnetic field is given by Fb=q(v×b). In a certain region of space both electric field and magnetic field exist mutually perpendicular if an electron enter this region perpendicular to both E and B and passes out undeflected find velocity of electron.

Answer 1

It's the condition what we called "velocity selector".

And in result velocity is given by

v = E/B

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