Q 12-02-021NEETJEE MainEasy
The electric potential in a region is $V = 4x^2$ volt, with $x$ in metres. The electric field at $x = 1$ m is
Answer: (B) $8$ V/m along $-x$
$E_x = -\dfrac{dV}{dx} = -8x = -8$ V/m at $x = 1$: magnitude $8$ V/m, pointing along $-x$.
Solution by Sreeraj P, M.Sc Physics