2
39
0
2 4
10
4
e
G
p
e
F
e
F
εGm m
=
=
×
π
(ii) On similar lines, the ratio of the magnitudes of electric force
to the gravitational force between two protons at a distance r
apart is:
FF
e
Gm m
e
G
p
p
=
=
2
4πε0
 1 3 × 1036
However, it may be mentioned here that the signs of the two forces
are different For two protons,  the gravitational force is attractive
in nature and the Coulomb force is repulsive