Electrostatics and Insulators Concepts

The video tutorial explains the classification of materials based on their ability to conduct electric charges. It introduces the concepts of conductors and insulators, detailing how materials like copper and silver allow charges to move, while materials like plastic and glass do not. The tutorial discusses the properties of conductivity and dielectric strength, and their importance in practical applications, such as in electrical systems and safety measures. The session concludes with a summary and a preview of the next class on dielectric strength.

What happens when you rub a plastic object and bring it near paper pieces?

• The paper pieces are repelled.

• The paper pieces catch fire.

• The paper pieces remain unaffected.

• The paper pieces are lifted.

Why does a metal plate not lift paper pieces after being rubbed?

• It is not charged.

• The charge is transferred to the earth.

• It is positively charged.

• It is too heavy.

Which of the following is an example of an insulator?

• Plastic

• Silver

• Iron

• Copper

What is the primary function of a conductor?

• To prevent charge movement

• To repel charges

• To store charges

• To allow charge movement

Why are insulators used on electrical poles?

• To reduce the weight of wires

• To prevent charges from reaching the ground

• To enhance conductivity

• To increase the speed of electricity

What is the role of an insulator in electrical systems?

• To increase electrical power

• To prevent unwanted charge movement

• To conduct electricity

• To decrease electrical resistance

What property of a conductor determines its effectiveness?

• Dielectric strength

• Conductivity

• Weight

• Color

What is the term used to describe the ability of an insulator to hold charge?

• Dielectric strength

• Thermal resistance

• Magnetic strength

• Conductivity

Which material is likely to have high dielectric strength?

• Copper

• Glass

• Aluminum

• Silver

What happens to the charges in a conductor when it is connected to the earth?

• They are neutralized.

• They become positively charged.

• They are transferred to the earth.

• They accumulate on the surface.