Electricity & Magnetism

Electric Dipole Field (Axial)

E = \frac{2 k p}{r ^{3}}

Electric field along the axis of an electric dipole.

Variables

E

Electric field

Field on axis

N/C

k

Coulomb constant

8.99×10⁹

N·m²/C²

p

Dipole moment

Electric dipole moment

C·m

r

Distance

From dipole center (r >> d)

m

Derivation

From superposition of fields from +q and -q, for r >> d.

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