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A beam of electrons is moving with const...

A beam of electrons is moving with constant velocity in a region having simultaneous perpendicular electric and magnetic fields of strength `20Vm^(-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

`20 ms^(-1)`

B

`40 ms^(-1)`

C

`8 ms^(-1)`

D

`5.5 ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
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