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The variation of potential with distance...

The variation of potential with distance r from a fixed point is shown in fig. The electric field at r = 5cm, is :

A

`(2.5)V//cm`

B

`(-2.5)V//cm`

C

`(-2//5)V//cm`

D

`(2//5)V//cm`

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The correct Answer is:
A
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