A light polystyrene ball coated with a thin layer of metal diagram 1 shows the ball on a metal plate in diarame 2 the plate has been charged and the ball is rising to hit the earth lid State the sign and charge of the ball as it moves upwards.

Explain Why the ball moves upwards.

The ball discharges when it hits the lids.

Explain how the ball loses its charge.

The ball continues to move up and down between the charged plate and Lid.

Explain why the ball continues to move up and down.