Charging by Friction: Understanding and Demonstrating the Transfer of Electric Charge Between Insulators

The video explains how rubbing two insulators together can charge them through friction. It distinguishes between conductors and insulators, and describes how electrons transfer between materials, resulting in positive and negative charges. The concept of electrostatic force is introduced, explaining attraction and repulsion between charged objects. A demonstration using polythene rods and a dry cloth illustrates these principles, showing how like charges repel and opposite charges attract.

What happens when two insulators are rubbed together?

• One becomes positively charged and the other negatively charged.

• They both become negatively charged.

• They remain neutral.

• They both become positively charged.

Which of the following is an example of an electrical conductor?

• Glass

• Plastic

• Rubber

• Graphite

What type of force is experienced between two charged objects without direct contact?

• Gravitational force

• Magnetic force

• Electrostatic force

• Nuclear force

What happens when two objects with the same charge are brought close to each other?

• They attract each other.

• They repel each other.

• They become neutral.

• They lose their charge.

In the demonstration, what happens when a charged polythene rod is brought near a dry cloth?

• The rod loses its charge.

• The rod attracts the cloth.

• The rod becomes neutral.

• The rod repels the cloth.