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Question

In a certain region of space electric field Eand magnetic field B are perpendicular to each other. An electron enters in the region perpendicular to the direction of B and E both. If it moves un-deflected, then velocity of the electron is:

A
EB
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B
E×B
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C
BE
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D
EB
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Solution

The correct option is B EB
For the electron to pass undeflected, electric force on electron will equal and in opposite direction to that of the magnetic force.
Fe=FB
qE=q(v×B
|v|=EB

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