Please Solve Both Questions Compute the ratio of the electric force to the gravitational force exerted by a proton

on an electron in a hydrogen atom: $m_p=1\mathrm{.}67{10}^{-27}Kg$;$m_e=9\mathrm{.}11{10}^{-31}Kg.$

$(2-$pnts$)$

A disk of radius $5cm$ is in the $yz$ plane with its center at the origin. The disk carries a

uniform surface charge density of $1\mathrm{.}3\frac{C}{m^2}.$ Find the electric potential at $x=120$

cm$.(2-$pnts$)$Pl