Static Electricity

1. Static Electricity Sumber Gambar : site: gurumuda.files.wordpress.com Sumber Gambar Fisika SMK Teknologi, Direektorat SMK

2. Phenomenons 0f Static electricity Hard ruber stick, a Stick of glass or a ruler of plastic is scrubed in cloth Plastic ruler is scrubed in dry hair Phenomenons 0f Static electricity Iron nyilon cloth and all that Phenomenons of Static electricity

3. Electric Charge Two plastic rulers and two glass sticks are scrubed by drugget so each are be charge The two of ruler mutual refuse to averse Sumber Gambar Modul Listrik Statis, Direktorat Pendidikan Menengah Kejuruan Anything is scrubed in different thing with the result that static electricity, so thing is called containt electric charge. Phenomenons of Static electricity

4. Electric Charge The two of glass sticks mutual refuse to averse A plastic ruler and a glass stick are trade-offs Phenomenons of Static electricity

5. Electric Charge Everything that is pulled glass so pussed away plastic ruler Everything that is pussed away glass so pulled plastic ruler The Phenomenons show there are two kinds of electric charges negative charges (-) positive charges (+) Franklin choose electric charges in glass as positive charges, and electric charges in plastic as negative charges. On time the treaty still are used there are two kinds of electric charges

6. Electric Charge Have symbol Q or q SI unit electric charge is Coulomb (C) Electric Charge Elementary charge is 1,6 x 10 -19 C The charge on a single electron is -1.6 x 10 -19 Coulomb The charge on a single proton is +1.6 x 10 -19 Coulomb Electric Charge

7. Coulomb’S Law F12 = forceatparticle 1 byparticle 2 ( Newton ) F21 = forceatparticle 2 byparticle 1 (Newton ) r =the distance of separation between the two objects (meters ) k = a proportionality constant known as the Coulomb's law constant is dependent upon the medium that the charged objects are immersed in k In the case of air & vacuum , the value is approximately 9,0 x 109 Nm2 / C2 Coulomb’S Law Class XII

8. Coulomb’S Law Value k (constanta ) besides air or vacuum  = permitivitas a media o= permitivitas of air or vacuum K = dielectrik constanta For air or vacuum K = 1 Hukum Coulomb

9. Hukum Coulomb = F F Hukum Coulomb

10. Hukum Coulomb Contoh soal On the air found two electricity charge 10 μC and 40 μC and apart in distance 20 cm • How much is big load second interaction force? • When does second load laided at a medium that has dilelectric • constant 3, how much is force that undergone by 40 μC ? Hukum Coulomb

11. Hukum Coulomb Penyelesaian : a. Hukum Coulomb

12. Hukum Coulomb b. = 30 N Hukum Coulomb

13. The electric field A convenient way of visualizing electric field patterns is to draw lines that followthe same direction as the electric field vector at any point. These lines, called electric field lines An electric field is said toexist in the region of space around a charged object. When another charged objectenters this electric field, an electric force acts on it. Medan Listrik di sekitar muatan

14. Electric field E The number of lines per unit area through a surface perpendicular to the linesis proportional to the magnitude of the electric field in that region E Electric field lines penetrating two surfaces. The magnitudeof the field is greater on surfaceA than on surface B Sumber : Halliday-Resnick-Walker The magnitudeof the electric field

15. Magnitude of the Electric Field the electric field E at a point in space is defined as the electric force F actingon a positive test charge q placed at that point divided by the magnitude of thetest charge E . E = electric field ( N/C) q = electricity charg (Coulomb) F = static electricity charge (Newton) it has value belongVector QUANTITIES Elctric field it has direction Kuat Medan Listrik

16. Electric Field direction at a Point • Electricity field intensity direction is unidirectional and correlating to squeez with the electric force F actingon a positive test charge q placed at that point divided by the magnitude of thetest charge B . A E + . E Arah kuat medan listrik

17. Electric Field aroud negative electricity Charge B . A E - . E Arah kuat medan listrik

18. Electric Field in area between two electricity charge At point C doesn’t has electric field Medan Listrik

19. Electric Field in area between two electricity charge There is a point between two electricity charge that has strongest Electric Field Medan Listrik

20. The Eletric Field Around Electricity Charge In order to determine electric filed at point A we put electricity charge as q at point A. + A Q . r E Q Q F F E = k = = k q E = E = r 2 r 2 q q Kuat Medan Listrik di sekitar muatan titik The electric field at a point, such as A, that has distance of electrical charge particale as Q

21. Electric Flux Field lines representing a uniform electric field penetrating a plane of area A perpendicularto the field. The electricflux E through this area is equalto EA  = E x A Sumber : Haliday Resnick, 745 Fluks Listrik

22. Electric Flux When area A is at an angle to the field:  = E x A cos  Sumber : Haliday Resnick, 745 Fluks Listrik

23. Gauss’s Law The net flux through any closed surface surrounding a point charge q is given by q/o Karl Friedrich Gauss (1777–1866) Hukum Gaus

24. Gauss’s Law the net electric flux through aclosed surface thatsurrounds no charge is zero Hukum Gaus

25. Hukum Gaus If E is perpendicular to area A, so  = E x A Q = electrical charge in closed surface ( Coulomb ) Q E x A =  = charge density ( C/m2 ) o  Q = Q E E = o o  = o A o = permitivitas of air or vacuum = 8,85 x 10-12 C2 N-1m-2 Hukum gaus