Question

Find the magnitude of the charge if it has a Voltage of 13 V with a distance of 25 mm

Answer 1

The voltage produced by a point charge

$$V=k\frac{q}{r}$$

Hence, the magnitude of charge

$$q=\frac{Vr}{k}=\frac{13\times 0.025}{9\times 10^9}=36\times 10^{-12}\:\rm C=36\: pC$$