A science museum demonstrator is preparing an interactive exhibit on electrostatic forces using an inflated latex balloon, a glass rod, woollen cloth, and silk.
Describe a simple observation that would show the balloon has become electrostatically charged after being rubbed with the woollen cloth.
Explain, in terms of particles, how the latex balloon gains a negative charge when it is rubbed with the woollen cloth.
Describe an experimental method the demonstrator could use, with the setup shown in the diagram below, to demonstrate that there are two opposite types of electrostatic charge.
