Question

The variation of potential with distance R from the fixed point is shown in Fig. The electric field at $R=5m$ is :

• A. $2.5$ V$m^{-1}$
• B. $-2.5$ V$m^{-1}$
• C. $0.4$ V$m^{-1}$
• D. $-0.4$ V$m^{-1}$

Answer 1

The correct option is A $2.5$ V$m^{-1}$

$E=-\frac{dV}{dr}$

$E=-\frac{0-5}{6-4}$

$E=2.5V/m$