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Q.

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

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a

2.5  Vm−1

b

−2.5  Vm−1

c

0.4  Vm−1

d

−0.4  Vm−1

answer is A.

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Detailed Solution

E=dVdr = negative of the slope of V-R graph.
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