In a certain region of space electric field 
and magnetic field 
are perpendicular to each other and an electron enters in region perpendicular to the direction of 
and 
both and moves undeflected, then velocity of electron is:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
For electron to pass undeflected,
electric force on electron = magnetic force on electron
i.e. eE = evB
or v = 
or 
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