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A long cylindrical wire carries a positi...

A long cylindrical wire carries a positive charge of linear density `lambda`. An electron `(-e ,m)` revolves around it in a circular path under the influence of the attractive electrostatic force. Find the speed of the electron.

A

` sqrt ((e lambda)/(4pi epsilon_0 m^2))`

B

` sqrt ((e lambda)/(2pi epsilon_0 m))`

C

` sqrt ((e^2 m)/(2pi epsilon_0 lambda))`

D

` sqrt ((e m)/(4pi epsilon_0 lambda))`

Text Solution

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The correct Answer is:
B
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