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A cathode ray beam is bent into an arc o...

A cathode ray beam is bent into an arc of a circle of radius `0.02m` by a field of magnetic induction `4.55` milli tesla. The velocity of electron is (given `e=1.6xx10^(-19) c` and `m=9.1xx10^(-31)kg)`

A

`2xx 10^(7)m//s`

B

`3xx 10^(7)m//s`

C

`1.6xx10^(7)m//s`

D

`3.2 xx 10^(7)m//s`

Text Solution

Verified by Experts

The correct Answer is:
C
`v=( r Be)/(m)`
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