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Four equal positive charge are fixed at ...

Four equal positive charge are fixed at the vertical of a square of side L. Z-axis is perpendicular to plane of the square. The point `Z=0` is the point where the diagonals of the square intersect each other. The plot of electic field due to the charges, as one moves on the Z-axis is

A

B

C

D

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The correct Answer is:
D
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