First slide

Electrostatic potential

Question

In a region of space as we are moving along positive x-axis, electric potential is gradually decreasing. Then electric field at any point on the x-axis is directed along

Easy

A

positive y-axis
B

negative y-axis
C

positive z-axis
D

positive x-axis

Solution

$\vec{E} = - \frac{dV}{dx} \hat{i} since \frac{dV}{dx} is negative, \vec{E} = (A positive quantity) \hat{i} .$

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