If the balloon is held close to an uncharged scrap of paper, the paper and the balloon will attract each other. Use the idea of charging by induction to explain this.

A girl has two metal bars, $1$ and $2$. When the girl holds one end of bar $1$ near a magnet, she finds that it attracts both the N pole and the S pole of the magnet. What does this tell you about bar $1$?

A girl has two metal bars, $1$ and $2$. When the girl holds one end of bar $2$ near the magnet, it attracts the N pole of the magnet, but repels the S pole. What does this tell you about bar $2$?

In an experiment, the girl uses two table-tennis balls A and B. Each is coated with a thin layer of conducting material. Ball A is mounted on an insulating stand and ball B is suspended from a thin nylon thread. The arrangement is shown in the diagram.

Ball A is given a negative charge, and is slowly moved towards ball B until it touches. Predict what is seen to happen.