The electric potential decreases unifromly from 120 V to 80 V as one moves on the x-axis from x=-1 cm to x=+1 cm. The electric field at the origin

Options

A. `(i)` only
B. `(ii),(iii)`
C. `(ii),(iii),(iv)`
D. `(iii),(iv)`

Answer

2

Explanation

It may be that charges of same magnitude but opposite sign may have placed on `y`-axis in such a manner that potential due to them on `x`-axis is zero, but they will produce electric field in addition to `(120 - 80)/(2) = 20 V//cm`
SO field at origin may be `20 V//cm` or greater than `20 V//cm`.