Test on Electrostatics

One mark questions

1. Write the unit of electric flux.
2. Write any two methods of charging a body.
3. Two electric field lines never intersect, why?
4. Write the value of permittivity with unit.
5. Write superposition principle for electric forces.

Three marks questions

1. Define coulomb’s law. Write its vector form.
2. Write the principle of quantization of electric charges. What is the minimum charge possible on any element?
3. How much negative charge is present in 23g of sodium. What can you say about the amount of positive charge present in it?
4. Write the properties of electric field lines.
5. What do you mean by electric flux? Write the factors on which electric flux depends.
6. Write three basic properties of the electric charges.
7. What happens when a dipole is placed in uniform electric field?
8. The vertices of an equilateral triangle of side 6 cm contains 8 \(\mu C\), 10 \(\mu C\) and 12 \(\mu C\) respectively. Find the potential energy of this charge system.

Five marks questions

1. What is a dipole? Derive an equation for electric field due to a dipole at its axial point.
2. Write Gauss’s theorem. What is Gaussian surface. Using it find the electric field due to a uniformly charged infinite plane sheet.
3. What is the difference between potential energy and potential. Derive an expression for the potential at a point due to a point charge.