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Two large identical plates are placed in...

Two large identical plates are placed in front of each other at `x = d` and `x = 2d` as shown in the figure. If charges on plates are Q and `-5Q`, the potential versus distance graph for region x = 0 to x = 3d is (d is very small and potential at x = 0 is `v_0`)

A

B

C

D

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A
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