ElectrostaticsHard

Question

The electric potential decreases uniformly from 180 V to 20 V as one moves on the X-axis from x = − 2 cm to x = + 2 cm. The electric field at the origin :

Options

A.must be equal to 40V/cm.           
B.may be equal to 40V/cm.
C.may be greater than 40V/cm.       
D.may be less than 40V/cm.

Solution

from given data  Ex = V/cm = 40 V/cm
but E = ⇒    E may be equal or greater than 40 V/cm ie.

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