A Comparison of Electric and Gravitational Fields

A Comparison of Electric and Gravitational Fields

Gravitational Field Electric Field
Force is between Objects with mass Objects with charge
Constant of proportionality

G

Applies to all materials

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ε depends on the medium in which the field exists

Field strength in a radial field Copyright S-cool

Nkg-1 or ms-2

Vector

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NC-1 or Vm-1

Vector

Definition of Field Strength Force per unit mass Force per unit charge
Force in a radial field Copyright S-cool

Always attractive

Vector

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Can be attractive or repulsive

Vector

Potential in a radial field Copyright S-cool

Jkg-1

Scalar

Always less than zero.

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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

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