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1. Electronics (BS1102) Gauss law Prepared by Dr . AbedElhamid R. Khattab 1

2. Lecture Objectives The Electric Field 2- Gauss Law 1- Coulomb's Law

3. The Electric Field 1- Coulomb's Law

4. The Electric Field Coulomb's Law       Coulomb’s Law     r               + - -                  

5. Michael Faraday Electric Field The Electric Field Lines 1791 - 1867

6. Michael Faraday Electric Field The Electric Field Lines 1791 - 1867 The rules for drawing electric field lines are as follows: 1. The number of lines drawn leaving a positive charge or approaching a negative charge is proportional to the magnitude of the charge. 2. No two field lines can cross. 3. The lines must begin on a positive charge and terminate on a negative charge. In the case of an excess of one type of charge, some lines will begin or end infinitely far away.

7. Electric Field The Electric Field Lines

8. Motion of a Charged Particle in a Uniform Electric Field

9. Motion of a Charged Particle in a Uniform Electric Field

10. The Electric Field 2- Gauss Law

11. Electric Field By Gauss Law The Electric FLUX

12. Gauss Law Electric Field By Gauss Law  

13. Gauss Law Electric Field By Gauss Law    

14. Gauss Law Rank the electric fluxes through each Gaussian surface shown in the figure from largest to smallest. Electric Field By Gauss Law

15. Gauss’s law follows from the inverse square aspect of Coulomb’s law

16. TRUE or FALSE? All particles contribute to the electric field at point P on the surface. The net flux of electric field through the surface due to q 3 and q 4 is zero. The net flux of electric field through the surface due to q 1 and q 2 is proportional to (q 1 + q 2 ). All True A F Gauss’ Law

17. Line symmetry Field of a line of charge (line of charge) A section of an infinitely long wire with a uniform linear charge density, . Find an expression for E at distance r from axis of wire.