Charging by Rubbing

Q. How is charging by friction different from charging by induction? [4 marks]

Q. Which of the following cannot be charged easily by friction?

1. Plastic scale
2. Inflated balloon
3. Woollen cloth
4. Copper rod

Q. What is the nature of electrical charges generated by rubbing two objects?

1. Static
2. Mobile
3. Positive
4. Negative

Q. If the number of protons present in a body is the number of electrons, the body is positively charged.

1. greater than
2. less than
3. equal to

Q. A spark can be generated by rubbing wool against amber.

1. True
2. False

Q. When a glass rod is rubbed with a silk cloth, glass loses and acquires a charge.

1. neutrons
2. protons
3. electrons
4. positive
5. negative

Q. Transfer of electric charges can take place between two bodies through a conductor.

1. True
2. False

Q. On rubbing glass rod and silk, if the glass rod loses five electrons, wool gains electrons.

1. less than five
2. more than five
3. five

Q. On earthing, a negatively charged body gains electrons to become neutral.

1. False
2. True

Q. There are three types of electric charges - positive, negative and neutral.

1. False
2. True