Short Answer Type Question From Electrostatics (Coulomb's Law)

1. Ordinary rubber is an insulator. But the special rubber tyres of aircrafts are made slightly conducting. Why is this necessary?
2. What is the iomportance of expressing Coulomb's law in vector form?
3. Can a charged body attract an uncharged body? Explain.
4. Compare the electrostatic and gravitational force between two protons kept ceratian distance apart.
5. Vehicles carrying inflammable materials usually have metallic ropes touching ground while in motion. Why is it necessary?
6. Why frictional electricity demonstrations donot work successfully in humid regions?
7. Calculate the no. of excess electrons in 1 C of negative charge,
8. Define dielectric constant of a medium on the basis of coulomb's law.
9. Why electrostatic forces cannot be the cause of controlling the motionof celestial bodies?
10. How is the force between two point charges kept certain distyance apart affected if a third point charge is kept in between them?