A small particle carrying a negative charge of `1.6xx10^-19C` is suspended in equilibrium between two horizontal metal plates 10cm apart having a potential difference of 4000V across them. FInd the mass of the particle.

Two plates are 1.5 cm apart, and a potential difference of 7.5 volt is applied between them, the electric field between the plates is

Two charged particles having equal charge of 3xx10^-5C each are brought from infinity to a separation of 30 cm. Find the increase in electrostatic potential energy during the process.

Three condensers having capacities of 10 mu F , 20 mu F and 30 mu F respectively are connected in series and a potential difference of 220 volt is applied across the combination. Find the resultant capacity the charge on each plate and the potential difference across each condenser.

A wire carries a current of 0.1 A for 10 seconds. If the work done in this process is 20 J, find the potential difference between the two ends of the wire.

Derive an expression for the electric intensity due to an electric dipole at a point on the axis of dipole. When a point charge of 5 xx 10^-9 C is taken from point A to point B, the work done is 10^-6 J. Find the potential difference between points A and points B.

A potential difference of 5000 volt is applied between two parallel plates 5cm apart a small oil drop having a charge of 9.6 xx 10^-19 C falls between the plates. Find (a) electric field intensity between the plates and (b) the force on the oil drop.