(a) Derive the relation between CGS and SI unit of power.

(b) A man is holding a suitcase in his hand at rest. What is the work done by him?

A meter scale is balanced in horizontal position as shown in figure below. Find the value of w.

It is established that an electric current through a metallic conductor produces a magnetic field around it. Is there a similar magnetic field produced around a thin beam of moving

(a) α-particles and

(b) neutrons? Justify your answer.

Write the uses of radio isotopes in

(a) agriculture

(b) industries.