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Four point charges are kept on y-axis at...

Four point charges are kept on y-axis at `(0,a),(0,2a),(0,-a) and (0,-2a)` as shown in the figure. Which of the following graphs, best represents the variation of electrostatic potential V as a function of distance `x` from the origin, on the x-axis.

A

B

C

D

None of these

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The correct Answer is:
D
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