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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



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


Grade:upto college level

1 Answers

Kevin Nash
askIITians Faculty 332 Points
7 years ago

(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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