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# Static electric

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### Static electric

1. 1. By Mr. Joe
2. 2. • Explain the concept of electric charge and its interaction.• Explain that an object can be electrically charged by being rubbed• Calculate the interactional force between electric charges by using Coulombs law.• Explain the concept of electric field
3. 3. Klik STATIC ELECTRIC Listrik Tidak MengalirKlik Plastic ruler Litle Paper tearKlik Why is plastic ruler that is rubbed on hair can pull little papers? To get answer question upon us need to understandKlik about atom.
4. 4. Klik Atomic Model 1. Atom Hidrogen ( H ) Klik
5. 5. Klik 2. Atom Helium ( He ) 3. Atom Litium ( Li ) KlikKlik How many proton on Helium upon? How many elektron on HeliumKlik upon? Klik How many proton on Lithium atom What is Helium atom getsKlik electricity? upon? Klik How many electron on LithiumKlik Why is Helium atom neutral? atom upon? Klik What is Lithium atom getsKlik Conclusion electricity? if which atom was said by neutral? Klik Why is Lithium atom neutral?
6. 6. Getting electricity on object by rubsKlik KlikKlikKlikPlastic that rubbed by woolen clothes, thereforeplastic wills be get negative electricity, sincewoolen’s electron migrant to plasctic.
7. 7. Getting electricity on object by rubsKlik Klik Klik Klik glass that rubbed by silk therefore glass wills be get positive electricity, since glass electron migrant goes to silk.
8. 8. Klik Interaction among electricityKlik repeledKlik like charges repel each other
9. 9. Klik Interaction among electricityKlik attratedKlik unlike charges attract each other.
10. 10. Coulombs lawKlikKlikKlikKlikKlik
11. 11. • The force between two charges is equal to Coulomb’s constant, times the product of the two charges, divided by the square of the distance between them. F = coulomb force( N ) q1 q 2 F k 2 q = charge ( C ) r r k = distance ( m ) = coulomb constanta Satuan SI Cgs F N dyne Q C Stc r m cm K Nm2/C2 dyne cm2/ Stc2 Nilai 9.109Nm2/C2 1 dyne cm2/ Stc2
12. 12. Klik Example • Two charges Q1 and Q2, have 3µC dan –Klik 2 µC are separated by a distance 10 cm if Coulombs Constanta is 9.109 N m2/C2 What total force are them?Klik Q .Q Catatan F k 1 22 R Ubah satuan – satuan 6 6 3.10 C.2.10 C besaran yang ada F 9.109 Nm 2 / C 2 (0,01m) 2 kedalan satuan SI 9 23.10 6 C.2.10 6 C 2 F 9.10 Nm / C μC = 10 –6 C (0,0001m 2 ) cm =10 –2 m 9 23.10 6 C.2.10 6 C 2 F 9.10 Nm / C 10 4 m 2 F = 54 N
13. 13. Klik Electric fieldKlik The electric field is the space around an electrical charge which is still influenced by theKlik object’s electric charge.Klik E q Q E q Q The more far the location of the test object from charged objects Q thenKlik the force gets smaller influence so strong electric field is getting smaller
14. 14. Klik Coulomb force’s Lines • Electric field figured by Coulomb force’s lines.Klik Klik Direction of electric lines of Direction of electric lines of force charge positif, leaving a force charge negative, toward charge the charge
15. 15. Klik The pattern on the electric lines of force Klik Klik Klik Klik
16. 16. Klik Strong electric fields Benda bemuatan listrik Q didekatkan benda uji bermuatan q berjarak rKlik Besar kuat medan listrik di titik benda uji adalah gaya listrik yang ditimbulkan benda bermuatan di bagi muatan uji Q qKlik E r KlikKlik F Qq E = electric field ( N/C ) E E k 2 Q = Source Charge ( C ) q r q q = test charge ( C ) r = distance ( m ) F = Coulomb Force ( N ) Q E k 2 r
17. 17. Klik Electrostatic InductionKlik NetralKlik What happens to the charge neutral object ,whenKlik approached by a positively charged object?Klik Conclusion: Elctrostatic induction is the phenomenon where electric charge separate in neutral object when a object closed by elictric charge.
18. 18. Klik Getting negative electricity on object with inductionKlik NeutralKlik BumiKlik Negatif chargeKlik Neutral objects when induced by positively charged objects will become negatively charged
19. 19. Klik Getting a positive electric charge on an object by inductionKlik NeutralKlik Bumi Positif chargeKlik Neutral objects when induced by negatively charged objects will become positively charged Conclusion type objects induced charge opposite to the type ofKlik content objects that induce
20. 20. Klik Getting a negative electric charge by touching objects.Klik Neutral Klik Negatif charge Neutral objects when touched by aKlik negatively charged object will become negatively chargedKlik How do we explain when a neutral object when the object is positively charged touched the neutral object become positively charged?
21. 21. Klik Elektoscope • The instrument used to determine the electrical charge on the object. Elektroscope heaad conduktor Elektroscope leaf Glass wall
22. 22. Klik Karya Kreatif Tujuan : Membuat Elektroskop Sederhana Alat & bahan : 1. Botol bekas kecil 2. Alluminium foil (bekas bungkus rokok ) 3. Kawat tembaga 15 cm 4. Amplas 5. Gabus 6. penggaris plastik Langkah – langkah 1. Klik Ambil Alluminium fiol bekas bungkus rokok dan pisahkan kertas yang menempel pada Alluminium dengan cara membakarnya hingga Alluminium bersih dari kertas yang menempel. 2. Klik Potong Alluminium foil dengan ukuran 0.5 cm x 4 cm
23. 23. Klik Amplas kedua ujung kawat tembaga dan tekuk salah satu ujung kawat 3. tembaga hingga berbentuk seperti gambar. 4. Letakkan potongan Alluminium foil pada ujung kawat tembaga yang telahKlik ditekuk lalu lipat Alluminium foil tersebut seperti gambar. 5. Masukkan kawat tembaga yang telah diberi Alluminium foil ke dalam botolKlik dan tutup botol dengan gabus seperti gambar. 6. Remas Alluminium foil dan tancapkan pada ujung tembaga yang diluar botolKlik Gosokkan penggaris plastik pada rambut dan dekatkan pada kepala 7. elektroskop yang telah kamu buat amati apa yang terjadi dengan daun elektrokop ? 3 cm Di amplas 3 cm 1 2 3 4 5 Klik Klik Klik Klik
24. 24. Klik Electroscope working principles: at neutral electroscope leaves covered at Charged electroscope leaves covered
25. 25. Klik Electricity on electroscope with induction Klik Klik Klik Netral Electroscope head Klik Klik Electroscope head is Klik Electroscope closeed by touched out hand negatively positively charged therefore electron from charged object, electron earth go to lectroscope become from leaf moves to and counteracts since accepts head and electroscope leaf, electron from electroscope leaf therefore electroscope earth opens leaf closeJenis muatan benda terinduksi berlawanan dengan jenis muatan benda yang menginduksi KlikBagaimana kalau yang didekatkan pada kepala elektoskop benda bermuatan negatifJelaskan !
26. 26. Klik Kilat Because the house has a huge barrier when the electrons pass through a largeKlik number of houses will be damaged, which means that the house was struck by lightning.
27. 27. Prinsip Kerja Penangkal Petir 1 Ketika rumahKlik terinduksi oleh awan yang bermuatan sehinga atap rumah menjadi bermuatan positif maka muatan –Klik muatan negatif awan mengalir dari awan kebumi melewati Penangkal petir penamgkal petir,Klik karena penangkal petir terbuat dari bahan konduktor yang baik maka ketika dilewati muatan listrik negatif dari awan tidak menyebabkan kerusakan.
28. 28. Prinsip Kerja Penangkal Petir 2 Ketika rumahKlik terinduksi oleh awan yang bermuatan sehinga atap rumahKlik dan penangkal petir menjadi bermuatan positif karenaKlik penangkal petir terbuat dari bahan konduktor Penangkal petir yang ujungnya runcing maka udara disekitar penangkal petir akan terionisasi ion negatif akan ketarik penangkal petir dan dialirkan kebumi sedangkan ion positif akan ketarik awan dan menetralkan awan .
29. 29. Generator Van de GraffKlik• Mesin pembangkit listrik Prisip kerjaKlikstatis yang sangat besar Gesekan antara silinder Politen logam dengan sabuk karet menghasilkan muatan listrikKlik Klik negatif pada sabuk karet dan Bola Konduktor muatan negatif dialirkan ke bola konduktor. Bola konduktor akan bermuatan negatif yang sangat besar. Sabuk Gesekan antara politen karet dengan sabuk karet menyebabkan sabuk karet nemjadi bermuatan positif karena sabuk karet yang bermuatan positif dihubungkan dengan bumi logam maka elektron dari bumi menetralkan muatan positif pada sabuk karet.
30. 30. TAGIHAN SOAL 1 KlikPemahaman Konsep1. Lengkapi nama – nama partikel penyusun atom pada model atom di bawah Model atom ……………………. ……………………. ……………………. …………………….2. Atom natrium ( Na ) dan atom klor ( Cℓ ) yang semula netral kemudian karena sesuatu hal satu buah elektron terluar dari atom natrium pindah ke atom klor menyebabkan atom natrium kehilangan ………… dan menjadi bermuatan ……………, sedagkan atom klor menerima …………… dan menjadi bermuatan ………………3. Kaca yang digosok dengan kain sutra menjadi bermuatan listrik dan ditetapkan jenis muatannya adalah ……………………..Jelaskan secara listrik statis kaca dapat ermuatan listrik tersebut !4. Gaya apa yang muncul ketika plastic bermuatan yang digantung pada statif didekati dengan kaca bermuatan yang kita pegang tangan …………………5. Faktor apa yang mempengaruhi besar gaya listrik antara muatan …………6. Gambar arah medan listrik pada dua muatan positif yang berdekatan ?7. Apa yang dimaksud dengan Induksi listrik
31. 31. • Kinerja Ilmiah1. Lengkapi gambar peristiwa induksi di bawah dengan menambahkan muatan yang terdapat pada kepala dan daun elektroskopnya serta jelaskan terjadinya dengan teori listrik statis ? a. b.2. Jelaskan mengapa balon yang digosok – gosok dengan kain dapat menempel pada kaca3. Jelaskan prinsip kerja alat penangkal petir sesuai konsep listrik static.4. Dua buah muatan listrik yang masing-masing 4 C dan 3 C menimbulkan gaya listrik sebesar 8 N, jika jarak antara kedua muatan diperbesar menjadi 2 kali semula berapakah besar gaya listrik yang muncul sekarang ?5. Dua bola kecil yang bermuatan listrik sama dan sejenis digantung dengan tali seperti gambar. Jika besar gaya tolak yang muncul antara kedua muatan 0,1 N dan k = 9.109 N m2/C2 berapakah besar muatan masing-masing ? 3 cm
32. 32. 1. Glass rubbed on silk will be positively charged because .... a. Electron move from the glass to silk b. Proton move from the glass to silk c. Electron move from silk to glass d. Proton move from silk to glass2. The attractive or repulsive force betwwen two electric charge is .... a. Inversely proportional to their charges b. Directly proportional to the square of their charges c. Inversely proportional to the square of intercharge distance d. Directly proportional to the square of intercharge distance
33. 33. 3. Two electric charge, q1 and q2, at a certain distance (r), produce repulsive force F. If q1 is changed five times larger and the distance of two charge changed three times larger, the repulsive force becomes .... a.5/3 F b.5/6 F c.5/9 F d.9/5 F
34. 34. 4. Two object have electric charge of 2 x 10-5 C and 5 x 10-6 C is separated at a distance of 3 cm. If the constant k = 9 x 109 N m2/C2, the force between two object is equal .... a.1 N b.10 N c.100 N d.1000 N
35. 35. 5. Look at the table below. An object with electric Interaction charge X Y Repel each other X Z Attract each other Y Z ........... The interaction between Y and Z is .... a. Repel each other b. Attract each other c. No effect at all d. neutral
36. 36. 6. The interaction between two charges is F. If the distance of two charges becomes twice as much, their electric force is .... a. 0.20 F b. 0.25 F c. 0.40 F d. 0.50 F
37. 37. 7. The region around electric charge that isstill influenced by elektric force is called .... a. Electric field b. Coulomb’s force c. Electric potential d. Magnetic field•
38. 38. 8. Electric field strength is .... a. Force per unit area b. Force per unit charge c. Work per unit area d. Work per unit charge
39. 39. 9. Study the statement below. 1. Disimilar electric charge repel each other 2. An object will be negatively charged if the number of electron is more than the number of protons 3. Disimilar electric charge attract each other 4. An object will be positively charged if the number of electron is more than the number of protons The correct statements .... a. 1 and 2 b. 1 and 3 c. 2 and 3 d. 2 and 4•
40. 40. 10. Consider the statements below. 1. Field lines never cross each other 2. Field lines always go inward approaching a negative charge 3. Field lines always go outward approaching a negative charge 4. Field lines always go outward approaching a positive charge 5. The correct statements of electric field is shown by numbers .... a. 1, 2, and 3 b. 1, 3, and 4 c. 2, 3, and 4 d. 1, 2, and 4