Gravitational Field	Electric Field
Force is between	Objects with mass	Objects with charge
Constant of proportionality	G Applies to all materials	ε depends on the medium in which the field exists
Field strength in a radial field	Nkg-1 or ms-2 Vector	NC-1 or Vm-1 Vector
Definition of Field Strength	Force per unit mass	Force per unit charge
Force in a radial field	Always attractive Vector	Can be attractive or repulsive Vector
Potential in a radial field	Jkg-1 Scalar Always less than zero.	JC-1 Scalar Sign depends on charges
Definition of Potential	Work done in bringing a unit mass from infinity to the point in the field.	Work done in bringing a unit positive charge from infinity to the point in the field.
Potential Energy	Ep = Fm	W=VQ