Define 1 esu of charge

State Coulomb.s law in electrostatics and hence define units of charge in CGS (ESU) and SI system. Derive the relation between coulomb and stat-coulomb?

AB and CD are two perpendicular diameters of a circle of circumference 20pi cm. There are +10 esu, +10 esu, +10 esu and -10 esu of charges at A, B, C and D respectively. What is the Intensity of electric field at the centre O of the circle? What is the direction of the field?

What will be the surface density of charge of a sphere of radius 4 cm, if it is given 182 esu of charge?

The mass of a metal sphere charged with +20 esu is 2g. Another smaller sphere with -128 esu of charge is suspended with a thread. The former sphere, just below this smaller one, is at rest. What is the distance between the centres of the two spheres? g="980 cm . s"^(-2)

Define surface charge density .

Define 1 esu of potential.

Number of esu of charge in 1C is

The ratio of the emu of charge to esu of charge is :