A resistance R is connected across a cell with a switch and a rheostat in series. A voltmeter is connected parallel across the cell. Current in the circuit is increased using the rheostat.

(a) How will the voltmeter reading change? (increase / decrease / remain the same)

(b) Justify your answer stated in (a) above.

(a) Define natural vibrations.

(b) How is this vibration different from damped vibrations in terms of their amplitudes?

In an AC generator, name the part which has the following functions:

(a) intensifies the magnetic field.

(b) maintains electrical contact between the rotating parts and the external circuit.

Give two differences between nuclear fission and nuclear fusion.