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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, to move undeflected the velocity of electrons must be
(a) `8 m//s` (b) `20 m//s` (c) `40 m//s` (d) `(1)/(40)m//s`

A

`8ms^(-1)`

B

`5.5ms^(-1)`

C

`20ms^(-1)`

D

`40ms^(-1)`

Text Solution

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The correct Answer is:
D
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