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A unit negative charge with mass M resid...

A unit negative charge with mass M resides at the midpoint of the straight line of length 2a adjoining two fixed charges of magnitude `+Q` each if it is given n very small displacement `x(x lt lt a)` in a direction perpendicular to the straight line. It will

A

`F prop x`

B

`F prop 1/x`

C

`F prop x^(2)`

D

`F prop 1/x^(2)`

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