At a point 20 cm from an isolated point charge in air

PHYSICS · Subjective · CBSE · Physics · Electrostatic Potential and Capacitance · Electrostatic Potential and Capacitance

Problem

At a point 20 cm from an isolated point charge in air, the electric potential is measured to be 450 V. Find the magnitude of the charge. Take

k = 9\times10^{9}\,\mathrm{N\,m^{2}\,C^{-2}}