Guest

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
8 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.

 

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

ASK QUESTION

Get your questions answered by the expert for free