Alpha particle moving in speed from 1000 metre per second to 2000 into a velocity selector where the electric intensity is 300 and magnetic field of induction is 0.2 Tesla which particle will move undeviated through the field..
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→→→→→→∵ alpha particle experience same force in electric field as in magnetic field
So, f
E
=f
B
qE=qVB
V=
B
E
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