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# Charges

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## Charges

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
##### Presentation Transcript

1. Charges

2. e- P+ n nucleus Electrons

3. Source of Electrons(Force)

4. Solid Liquid Gas Plasma Matter : Weight - Space

5. valence shell e- P n nucleus Atoms

6. Atoms Atomic Number – Number of Protons Atomic Weight – Number of Protons plus Neutrons Number of Protons EQUALS Electrons in a neutral atom

7. Ionization The process where an atom gains or loses an electron. Na+Cl- Na – Positive Ion Cl – Negative Ion

8. Charges (q) Like Charges (++ - -) Repel q- q- q+ q+

9. Charges (q) Un-Like Charges (+ -) Attract q+ q-

10. Coulomb’s Law Coulomb (C) The quantity of charge on an abject. 1C = 6.25 x 1018 e-

11. Coulomb’s Law q1 q2 What does the force depend on?

12. d Coulomb’s Law q1 q2 1.The charge on q1 and q2. 2.The distance (d).

13. d d2 q-

14. d F ∞ q1q2 F ∞ 1/d2 Mathematical Model for Coulomb’s Law Force (F) q1 q2

15. d q1 q2 K q1q2 F = d2 K = 9.0 X 109 N·m2/C2

16. d=3cm q1 q2 q1= +6μC = +6x10-6C q2= +3μC = +6x10-6C d = 3cm = 3x10-2m K = 9.0 X 109 N·m2/C2 What is the force on q2?

17. K 9X109N·m2/C2(6X10-6C)(6X10-6C) (3X10-2m)2 q1q2 F = d2 F =1.8X102N q1 q2

18. Electric Fields Think of gravity or gravitational field to understand electric fields.

19. Electric Fields ++++++++++ neutral neutral - - - - - - - - - - E

20. Electric Fields ++++++++++ + - - - - - - - - - - + E

21. Electric Fields ++++++++++ - - - - - - - - - - - - E

22. Electric Fields A force field due to electric charges. A force on a charge due to another chage. E

23. r q kq E = r2 Electric Field: Point Charge

24. Q F E = q Force on a charge ‘q’ in an Electric Field q

25. Newton E = Coulomb F E = N E = q C

26. Energy and Work

27. + - Energy and Work It takes work to move the “-” charge.

28. + q’ Work on q’ Joule ΔV = = q’ Coulomb Electric Potential (Energy)Voltage = volt

29. + q’ Electric Potential (Energy)Voltage VA VB ΔV = VB - VA “Potential Difference”Voltage

30. Fd F ΔV = E = q q Eqd ΔV = q Electric Potential (Energy)Voltage

31. Example Two parallel plates are given opposite charges. A voltmeter measures the electric potental differnece to be 60V. The plates are 3.ocm apart. What is the magnitude of the electric field between them.

32. { ++++++++++ - - - - - - - - - - { E ΔV d ΔV=60.0V D=0.030m

33. Ed ΔVd = E 60V0.03m = E ΔV =

34. 2000J/(m·C)= E 2000 N/C = E

35. e e e e e e e e e e e e e e e e Current Flow of charge! Charge - Coulomb(C) 6.24 X 1018 electrons

36. Leyden Jar Conductors

37. - - - + - - - - + - + + + + + + + + + + Leyden Jar - - - - - - -

38. Capacitor A capacitor is a passive electronic component that stores energy in the form of an electrostatic field.

39. Metal Plates Insulating Material Dielectric Capacitor

40. e- e- e- e- e- e- e- e- e- e- e- e- e- e- e- e- e- e- e- e- e- e- Capacitor - +

41. Capacitor - - - - - - - - + + + + + + + +

42. Copper Zinc -

43. e e e e e e e e e e e e e e e e Current Number of electrons passing a point in a second.