derive an expression for dipole field intensity at any point on equatorial line of dipole
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Since equipotentials are surfaces where if a mass, m/charge, is moved along it no work is done.
W=mΔV, since ΔV=0, W=0If the field lines were not perpendicular, then there would be a component force on m.
If there is a force, then there must be work done, to move it.
Thus they must be perpendicular. [Ignore the parallel plates diagram]
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