Electricity & Magnetism
Electric Dipole Field (Axial)
Electric field along the axis of an electric dipole.
Variables
EN/C
Electric field
Field on axis
kN·m²/C²
Coulomb constant
8.99×10⁹
pC·m
Dipole moment
Electric dipole moment
rm
Distance
From dipole center (r >> d)
Derivation
From superposition of fields from +q and -q, for r >> d.
Your notes
0/5000
Common questions
What is the Electric Dipole Field (Axial) formula?
Electric Dipole Field (Axial) is written E = 2kp/r³. Electric field along the axis of an electric dipole. It belongs to Electricity & Magnetism, under Electrostatics.
What are the units in E = 2kp/r³?
In SI units, E is electric field, measured in kg·m/(A·s³); k is coulomb constant, measured in kg·m³/(A²·s⁴); p is dipole moment, measured in A·s·m; r is distance, measured in m.
How is the Electric Dipole Field (Axial) formula derived?
From superposition of fields from +q and -q, for r >> d. The result is E = 2kp/r³.