PHYSICS CLASS 12 - ASSIGNMENT 1 - ELECTRIC CHARGES AND FIELD

 PHYSICS - ASSIGNMENT 1

             CLASS 12

ELECTRIC CHARGES AND FIELD

1. What is Electric Charge? Name the SI unit.

2. What is Electrostatics? Mention any two applications.

3. State the fundamental Law of Electrostatics.

4. What is meant by Earthing? Mention its importance.

5. What are the basic properties of Electric charge?

6. State the law of Conservation of charge.  

    Give two examples.

7. State Coulomb's law in Electrostatics.  

    Express the same in SI units.

8. Write Coulomb's law in vector form.  

    Mention its importance.

9. Define Dielectric constant in terms of forces

    between two charges.

10. State the Principle of Superposition of Electrostatic 

      forces.  Write an expression for the force on a point 

      charge due to a distribution of N-1 point charges in

      terms of their position vectors.

11. Define Electric field at a point.  

      Give its SI unit and dimensions.

12. Obtain an expression for the Electric field intensity

      at a point at a distance r from a charge q.  Also 

      mention the nature of this field.

13. Deduce an expression for the Electric field at a point 

     due to a  system of N point charges.

14. What is Continuous Charge distribution?  Find the

      force on a point charge q due to a continuous 

      charge distribution?

15. Name the different types of Continuous Charge 

     distribution.

16.  Write an expression for the Electric field produced 

       by volume charge distribution.

17. Write an expression for the Electric field produced

       by Surface charge distribution.

18. Write an expression for the Electric field produced 

      by line charge distribution.

19. Obtain the formula for the Electric field due to a

      long thin wire of uniform Linear charge density 

      λ  without using Gauss's law.

20. Define Electric dipole. Give some examples.

21. What are ideal and point dipoles?

22. Define Dipole moment.

23. Define Dipole field.

24. Derive an expression for the Electric field at any 

      point on the axial line of an electric dipole.

25. Why does the dipole field at large distance fall 

      off faster than  1 / r^2 ?

26. Derive an expression for the Electric field at any 

      point on the equatorial line of an electric dipole.

27.  Give a comparison of the magnitudes of electric

       fields of a short dipole at axial and equatorial points.

28.  Give the physical significance of Electric dipoles.

29.  Derive an expression for the Torque on an electric 

      dipole placed in a uniform electric field.  Hence 

      define dipole moment.

30. What happens when an electric dipole is placed in a 

       non uniform electric field?

This assignment covers almost all the important concepts in the chapter Electric Charges and Fields.  Many questions in the following categories can be answered if assignments like this are systematically practiced.

1. Definitions 

2. Derivations 

3. Formulae 

4. Reasons and assertions

5. Sums based on these concepts

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