Electric Potential Due To A Dipole Far Field — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Electric Potential Due to a Dipole (Far Field) This approximation is valid when the observation point (r) is much greater than the separation distance of the dipole charges (r d). Define the dipole moment vector ( p ) as the product of charge magnitude and separation distance (p = qd). Calculate the potential V at a large distance r by approximating the charge distribution as a point source. The potential V is found to be proportional to 1 r 2 ( ). Determine the potential energy U by multiplying the potential V by the test charge q: U = qV. r d (where d is the dipole separation) q is the charge placed at the observation point. p is the magnitude of the dipole moment. Confusing the dipole moment (p) with the test charge (q). Assuming the potential energy U is proportional to 1 r (dipole approximation for near field). Forgetting that the potential energy U is the product of the test charge q and the potential V.