Coulomb's law is valid only for -------- charges

Permitivity of Air is

Area between the charges where no force act upon is called

Electric field lines originates from

Xerography is application of

Electric flux through a close surface does not depend on

Electric intensity of hollow charge is always

Electric potential is -------- quantity

1 volt/meter is also equal to

Two opposite point charges each of magnitude q are separated by a distance 2d. What is the electric potential at a point P mid way between them?

Electric potential at a point due to point charge depends on