The variation of potential with distance r from a fixed point is as shown in the figure. The electric field at R = 5 m is : 2.5 V/m– 2.5 V/m(2/5) V/m– (2/5) V/mSolution:\[ E=-\frac{d V}{dr}= -(\frac{-5}{2})= 2.5 V/m \]
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