GRAVITY :
1. Gravity is a weak force, but has only one sign of charge.
Electromagnetism is much stronger, but comes in two opposing signs of charge.
2.Gravitational charge is equivalent to inertia Electromagnetic charge is unrelated to inertia.
Electromagnetic force :
1. Electromagnetism is much stronger, but comes in two opposing signs of charge.
2. Electromagnetic charge is unrelated to inertia.