Question

Question #b8f8e

Answer 1

There are three similarities as discussed below.

Explanation:

Similarities

1. Both Gravitational force and Coulomb's force follow inverse square law with respect to the distance between the two interacting objects.
   `Fprop1/r^2`
2. Both these forces are proportional to the product of physical property of the interacting bodies. Mass in case of Gravitational force and charge in case of Coulomb's force.
   `Fprop k_1 k_2`
3. Both the electric and gravitational force fields satisfy Poisson's equation
   `∇^2Φ_G=4πρ_G`
   `∇^2Φ_E=−ρ_E/epsilon_0`

where `Φ_G and Φ_E` are the gravitational and electric potentials.
`ρ_G and ρ_E` are the mass and charge densities respectively
and `ε_0` is permittivity of free space.

This is where similarities end.