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A large flat metal surface has a uniform...

A large flat metal surface has a uniform charge density (`+sigma`). An electron of mass m and charge `rho` leaves the surface at the point A with speed u and returns to it at point B. Disregarding gravity the maximum value of AB is

A

`( v m in_0)/( sigma e)`

B

`(v^2 m in_0)/( e sigma )`

C

`(v^2 e)/(in_0 sigmam)`

D

`(v^2 sigma e)/( in_0 m)`

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The correct Answer is:
B
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