First slide

Electrostatic potential

Question

The variation of potential with distance r from a fixed point is shown in figure. The electric field at r = 3 cm is :

Easy

A

zero
B

-2.5 V/cm
C

+2.5 V/cm
D

+5 V/cm

Solution

$E = \frac{- dV}{dr}$ = - Slope of V-r curve
At r = 3 Slope = 0, so E = 0

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