A spherical liquid drop of 4mm diameter is given a charge of `2 * 10^-10` coulomb. If nine such drops coalesce to form a single drop, calculate the potential of the new drop.

A number of small drop of mercury coalesce adiabatically to form a single drop. The temperature of the drop.

Two drops of water of same size are falling through air with terminal veloity 10m/s. if the two drops coalese to form a single drop, what will be the new ternimal velocity?

Two equal drops of water are falling through air with a steady velocity of 10 cm/s. If the two drops recombine to a single drop, what will be the terminal velocity

A number of small drops of mercury condense isothermally to form a single drop. What will be the effect on temperature of the drop?

A silver wire of 1 mm diameter has a charge of 90 coulombs flowing in 1 hours and 15 minutes. Silver contains 5.28*10^28 free electrons per cm^3. Find the current in the wire and drift velocity in the electron?

A spherical liquid drop of radius R is divided into eight equal droplets. If surface tension is T, the work done in the process will be

An oil drop of 10^(-6) m radius carring a charge 4 times that of an election and remain suspended between two charged parellel plate .01m apart. Find the potential difference between the plates.

A hollow spherical conductor has charge 10^-7 coulomb of electric charge. Find the potential at the surface of the sphere. The radius of the sphere is 10 cm.

ABCD is a square of side 20 cm positive charges of +2 * 10^-9 C. +4 * 10^-9 C and + 8 * 10^-9 C are placed at the corners A, B and C respectively. Calculate the work required to be done to transfer a unit positive charge from D to the point of intersection of the diagonals.