(a) Define the term ‘self-inductance’ of a coil. Write its S.I. unit.

(b) A rectangular loop of sides a and b carrying current I2 is kept at a distance ‘a’ from an infinitely long straight wire carrying current I1 as shown in the figure.

Obtain an expression for the resultant force acting on the loop.

(a) Draw equipotential surfaces corresponding to the electric field that uniformly increases in magnitude along with the z-directions.

(b) Two charges – q and + q are located at points (0, 0, – a) and (0, 0, a). What is the electrostatic potential at the points (0, 0, + z) and (x, y, 0)?

(a) Write the relation between half-life and average life of a radioactive nucleus.

(b) In a given sample two isotopes A and B are initially present in the ratio of 1:2. Their half-lives are 60 years and 30 years respectively. How long will it take so that the sample has these isotopes in the ratio of 2:1?

Distinguish between unpolarized and linearly polarized light.

How is the drift velocity in a conductor affected with the rise in temperature ?