mass of charges, m1=m2=1g =10−3kg r=1m ∴ Gravitational force between them, FG=
Gm1m2
r2
=
6.67×10−11×10−3×10−3
12
[∴G=6.67×10−11N−m2∕kg2] =6.67×10−17N Again, charge on m1 and m2, q1=q2=1 femto coulomb =10−15C ∴ Electrostatic force between the both charges, Fe=
1
4πε0
⋅
q1q2
r2
=9×109×
10−15×10−15
12
=9×10−21N ∴ Clearly FG≫Fc Hence, gravitational force is dominant force.