Electric Dipole Field (Axial)
Electric field along the axis of an electric dipole.
Variables
Derivation
From superposition of fields from +q and -q, for r >> d.
Your notes
Constants in this formula
Check value
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- k = 8.988 × 10⁹ N·m²/C² (Coulomb constant)
- p = 2 C·m (Dipole moment)
- r = 3 m (Distance)
Result: E = 1.331556 × 10⁹ N/C
Other electricity & magnetism formulas with the same quantities
- Coulomb's Law (Electrostatics) shares Coulomb constant, Distance
- Electric Potential (Electrostatics) shares Coulomb constant, Distance
- Electric Potential Energy (Electrostatics) shares Coulomb constant, Distance
- Electric Flux (Electrostatics) shares Electric field
- Energy Density (Electric Field) (Capacitance) shares Electric field
Where this formula is listed
- Electricity & Magnetism formulas, under Electrostatics, alongside Uniform Electric Field and Gauss's Law.
- In the electricity & magnetism list it comes after Electric Dipole Moment and before Electric Flux.
- Electricity & Magnetism formula sheet, one of 48 formulas printed with symbol keys and SI units.
- The full formula index, grouped by category and topic.
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.