One hundred twenty five small liquid drops, each carrying a charge of `0.5muC` and each of diameter 0.1m form a bigger drop. Calculate the potential at the surface of the bigger drop.

Twenty seven charged water droplets each with a diameter of 2mm and a charge of 10^-12C coalesce to form a single drop. Calculate the potential of the bigger drop.

Two mercury drops each of radius r merge to form a bigger drop. Calculate the surface energy released.

A charge of 15muC is given to hollow metallic sphere of radius 0.3m. Find the potential:- at the surface of sphere

A sphere of radius1 0 cm carries a charge of 1 mu C . Calculate the electric field at the surface of the sphere

n small drops of same size are charged to V volt each. If they coalesce to form a single large drop,then its potential will be

64 small drops of mercury, each of radius r and charge q, coalesce to form a big drop. The ratio of the surface density of charge of each small drop that of the big drop is

A metal cube of each side 0.05 m long emits 0.6k cal in 80 seconds, Calculate the emissive power of its surface.

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.

A large number of liquid drops each of radius 'a' coalesce to form a single spherical drop of radish b. The energy released in the process is converted into kinetic energy of the big drops formed. The speed of big drop will be