The `+q` charge can be neutralised by

The ant bilte can be neutralised by

If q_(f) is the free charge on the capacitor plates and q_(b) is the bound charge on the dielectric slab of dielectric constant k placed between the capacitor plates, then bound charge q_(b) can be expressed as :

An isolated coductor, initially free from charge, is charge by repeated conacts with a plate, which afrer each contact has a charge Q due to some mechanism.If q is the charge on the conductor after the first operation, prove that the maximum charge that can be give to the conductor in this way is Qq//Q-q .

A charge q is placed at the centre of the line joining two equal charges Q. The system of the three charges will be in equilibrium if q is equal to: