(Based on Frictional electricity, , Conservation of charge, Quantization of charge, Coulomb’s law and principle of superposition)
Very Short Answer type Questions (1 mark)
- What is frictional electricity?
- What is the cause of frictional electricity?
- What is electrostatics?
- Write two devices based on electrostatics.
- Why static electricity is called so?
- How did electricity get its name?
- Which are the two kinds of charges?
- State the principle of conservation of charge.
- State the principle of quantization of charge.
- What do you mean by additive nature of charges?
- State Coulomb’s law of electrostatics.
- Define unit charge.
- Define relative permitivity of a medium.
- Define dielectric constant of a medium
- State the principle of superposition of electrostatic forces.
- Define linear density of charge
- Define surface density of charge
- What do you mean by annihilation of matter?
- Quarks are the building blocks of nucleons and possess fractional electronics charge. Does this discovery violate the principle of quantization of charge?
- Why the special tyres of aircrafts are made slightly conducting though ordinary tyres are insulators?
- Why vehicles carrying inflammable materials are earthed before transferring the fuels or other inflammable materials to or from the vehicle?
Short Answer type Questions (2 and 3 marks)
- State Coulomb’s law of electrostatics and express it in vector form.
- Explain the origin of frictional electricity on the basis of atomic structure.
- Describe an experiment to show that there are two kinds of charges and that “like charges repel and unlike charges attract”.
- Write the differences between mass and charge.
- Calculate the point between a proton and a helium nucleus kept 1 mm apart where a third proton will remain in equilibrium. Is the equilibrium stable or unstable?