Define conductivity of a conductor. Give its S.I. unit?

What do you mean by conductivity of a material? Give its SI unit.

Define capacitance. of a capacitor. Give its SI unit. Prove that the total electrostatic energy stored in a parallel plate capacitor is 1//2 CV^2 ?

Explain the term capacitance (or capacity) of a conductor. What are its S.I. units? Why is this unit so large? Name other units of capacitance.

What is torque ? Give its S.I. unit.

Define electric field intensity at a point. Give its S.I. units. Derive an expression for the electric field intensity at any point on the axial line of an electric dipole.

Define coefficient of viscosity. Give its unit.