The electric field at a point on the equatorial plane at a distance r from the centre of a dipole having dipole moment P is given by (r ≫ separation of two charges forming the dipole, ε₀ = permittivity of free space):
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Question

The electric field at a point on the equatorial plane at a distance r from the centre of a dipole having dipole moment P is given by (r ≫ separation of two charges forming the dipole, ε₀ = permittivity of free space):

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G1 Physics · Accepted Answer

Step 1: Field of a short dipole at an equatorial point is directed opposite to dipole moment. Step 2: Magnitude E = p/(4πε₀r³) for r much greater than dipole separation. Step 3: Along p-axis notation E⃗ = −p⃗/(4πε₀r³).