State the potential of the wire connected to the right hand side terminal of the three pin plug and also state its colour.

State two properties of magnetic lines of force around a straight conductor carrying current.

A ray of light PQ is incident normally on the face AB of an equilateral prism. The ray gets totally reflected from the surface AC.

Calculate:

(a) the angle of deviation at AC.

(b) the angle of incidence at BC.

The figure below shows a bicycle dynamo which is fitted to the tyre. When the wheels of the bicycle rotate, the spindle of dynamo attached to magnets rotate and the bulb glows.

(a) Name the phenomenon that takes place when the bulb glows while the person rides the bicycle.

(b) What will be the effect on the brightness of the bulb when the rider increases the speed of the bicycle?