Suppose the charge of a proton and an electron differ slightly. One of them is -e, the other is (e+ Δ e ). If the net of electrostatic force and…

Suppose the charge of a proton and an electron differ slightly. One of them is -e, the other is (e+ $\displaystyle \Delta \mathrm{e}$). If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distance d (much greater than atomic size) apart is zero, then $\displaystyle \Delta \mathrm{e}$ is of the order of [Given mass of hydrogen $\displaystyle \mathrm{m}_{\mathrm{h}}=1.67 \times 10^{-27} \mathrm{~kg}$ ]