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Two electrons are fixed at a seperation ...

Two electrons are fixed at a seperation of 2d from each other.A proton is placed at the mid point and displaced slightly in a direction perpendicular to line joining the two electrons. Find frequency of oscillation of proton

A

`f = 1/ 2pi (sqrt( 2ke^2/md^3))`

B

`f = 1/ 2pi (sqrt( ke^2/md^3))`

C

`f = 1/ 2pi (sqrt( ke^2/2md^3))`

D

none

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