The variation of potential `V` with distance `r` from dixed point is shown in Fig. The magnitude of electric field at, `r = 2 cm` (in volt/cm) is :

Answer

2

Explanation

From `E = (-dV)/(dr)`, Fig
`E = (-(4-0))/(2-0) = -2 V//cm`
In magnitude, `E = 2 vol t//cm`