What is an equipotential surface ? Write three properties Sketch equipotential surfaces of
(i) Isolated point charge
(ii) Uniform electric field
(iii) Dipole If charge Q is given to a parallel plate capacitor and E is the electric field between the plates of the capacitor the force on each plate is 1/2 QE and if charge Q is placed between the plates experiences a force equal to QE. Give reason to explain the above.

Explanation

If E. be the electric field due to each plate (of large dimensions) then net electric field between them
` E = E. + E. rArr E. E//2 `
Force on change Q at some point between the plates F = QE
Force on one plate of the capacitor due to another plate ` F. = QE. = QE//2 `