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A beam of electrons is moving with constant velocity in a region having simultaneous perpendicular electric and magnetic fields of strength 20 Vm-1 and 0.5 T respectively at right angles to the direction of motion of the electrons.
Then the velocity of electrons must be
(a) 8 m/s
(b) 20 m/s
(c) 40 m/s
(d) 1 m/s
(c)
As electron move with constant velocity without deflection. Hence, force due to magnetic field is equal and opposite to force due to electric field.
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