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The variation of potential with distance...

The variation of potential with distance R from a fixed point is shown in figure. The electric field at R = 5 m is -

A

`2.5 Vm^(-1)`

B

`-2.5 Vm^(-1)`

C

`0.4 Vm^(-1)`

D

`-0.4 Vm^(-1)`

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The correct Answer is:
A
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