1) 2018 S4 EOY P1 Q21

Two identical light and neutral conducting balls P and Q hang from insulating threads as shown below.

A negatively-charged conducting sphere is brought near to touch ball P and then removed. Assume that balls P and Q do not touch each other throughout the process. Which diagram shows the most likely final position of these two balls?

2) Two metal spheres X and Y are supported on two insulating stands and placed next to each other without contact.

Sphere X has a charge of +10 C and sphere Y is neutral.

Which statement is correct?

3) The diagram below shows a metal sphere resting on an insulating stand.

A negatively charged plastic rod is brought near to the metal sphere.

Which of the following descriptions is/are correct?

(1) Positive charge will flow to the left side of the metal sphere.
(2) Positive charge will flow from the earth to the metal sphere when the sphere is earthed by a finger.
(3) A net positive charge will be left on the metal sphere when the sphere is earthed by a finger.

4) Which of the following can attract a stream of water? Assume the stream of water has neutral charge.

(1) A negatively charged insulator.
(2) A negatively charged conductor.
(3) A neutral conductor.

5) To spray-paint a car, paint droplets are charged as the paint flows through the nozzle of the spray gun. This is to