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# Electrostatics Lecture

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### Electrostatics Lecture

1. 1. • Properties of Electric Charges • Electric Charge in the Atom • Static Electricity, Charge, and the Conservation of Charge Overview Electric Charge and Field > Overview Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics
2. 2. Lightning Lightning is a dramatic natural example of static discharge. Free to share, print, make copies and changes. Get yours at www.boundless.com Wikimedia. CC BY-SA http://upload.wikimedia.org/wikipedia/commons/thumb/4/44/Lightning_strike_jan_2007.jpg/800px-Lightning_strike_jan_2007.jpg View on Boundless.com Electric Charge and Field
3. 3. • Charge is measured in Coulombs (C), which represent 6.242×1018 e, where e is the charge of a proton.Charges can be positive or negative, and as such a singular proton has a charge of 1.602×10−19 C, while an electron has a charge of - 1.602×10−19 C. • Electric charge, like mass, is conserved. Properties of Electric Charges Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics/electric-charge-and-field/overview/properties-of-electric-charges Coulomb's Law View on Boundless.com Electric Charge and Field > Overview
4. 4. • An elementary charge -- that of a proton or electron -- is approximately equal to 1.6×10-19 Coulombs. • Unlike protons, electrons can move from atom to atom.If an atom has an equal number of protons and electrons, its net charge is 0.If it gains an extra electron, it becomes negatively charged and is known as an anion.If it loses an electron, it becomes positively charged and is known as a cation. Electric Charge in the Atom Free to share, print, make copies and changes. Get yours at www.boundless.com www.boundless.com/physics/electric-charge-and-field/overview/electric-charge-in-the-atom Planetary Model of an Atom View on Boundless.com Electric Charge and Field > Overview
5. 5. Static Electricity in a Slide Friction between the girl's hair and the slide results in a transfer of electrons, which causes the hair and slide to be attracted to one another. Free to share, print, make copies and changes. Get yours at www.boundless.com Wikipedia. "Static on the playground (48616367)." CC BY-SA http://en.wikipedia.org/wiki/File:Static_on_the_playground_(48616367).jpg View on Boundless.com Electric Charge and Field
6. 6. Charge Repulsion and Attraction Charges of like sign (positive and positive, or negative and negative) will repel each other, whereas charges of opposite sign (positive and negative) will attract each other. Free to share, print, make copies and changes. Get yours at www.boundless.com Wikimedia. CC BY-SA http://upload.wikimedia.org/wikipedia/commons/thumb/d/de/Charges_repulsion_attraction.svg/364px-Charges_repulsion_attraction.svg.png View on Boundless.com Electric Charge and Field
7. 7. Coulomb's Law • Provides a way of exactly calculating the force that charges exert on each other • q1 and q2 are the magnitudes of the charges (in Coulombs). • K is Coulomb’s constant. K = 8.99 x 109 kg m3 s-1 C-2. • R is the distance between the two charges. Free to share, print, make copies and changes. Get yours at www.boundless.com Wikipedia. "Coulombslaw." CC BY-SA http://en.wikipedia.org/wiki/File:Coulombslaw.svg View on Boundless.com Electric Charge and Field r F = Kq1q2 r2
8. 8. Coulomb's Law – Simplified for Chemistry 11 • The electrostatic force between two charges is… • Stronger if the product of the charges is larger • Stronger if the charges are closer together. • For most applications we will not need to use Coulomb’s law to calculate the exact magnitude of the force. Free to share, print, make copies and changes. Get yours at www.boundless.com Wikipedia. "Coulombslaw." CC BY-SA http://en.wikipedia.org/wiki/File:Coulombslaw.svg View on Boundless.com Electric Charge and Field r F = Kq1q2 r2
9. 9. Free to share, print, make copies and changes. Get yours at www.boundless.com Electric Charge and Field the massive, positively charged central part of an atom, made up of protons and neutrons A) atomic spectra B) nucleus C) radioactive decay D) nuclide
10. 10. Free to share, print, make copies and changes. Get yours at www.boundless.com Wiktionary. "nucleus." CC BY-SA 3.0 http://en.wiktionary.org/wiki/nucleus Electric Charge and Field the massive, positively charged central part of an atom, made up of protons and neutrons A) atomic spectra B) nucleus C) radioactive decay D) nuclide
11. 11. Free to share, print, make copies and changes. Get yours at www.boundless.com Electric Charge and Field The atom's net charge is determined by the number of A) negatively charged electrons and positively charged photons B) positively charged electrons and negatively charged protons C) negatively charged electrons and positively charged protons D) neutrons
12. 12. Free to share, print, make copies and changes. Get yours at www.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/ Electric Charge and Field The atom's net charge is determined by the number of A) negatively charged electrons and positively charged photons B) positively charged electrons and negatively charged protons C) negatively charged electrons and positively charged protons D) neutrons
13. 13. Free to share, print, make copies and changes. Get yours at www.boundless.com Electric Charge and Field An elementary charge - that of a proton or electron - is approximately equal to A) 1.6×1019 Coulombs B) 1.6×10-19 Coulombs C) 1.6 Coulombs D) 1 Coulomb
14. 14. Free to share, print, make copies and changes. Get yours at www.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/ Electric Charge and Field An elementary charge - that of a proton or electron - is approximately equal to A) 1.6×1019 Coulombs B) 1.6×10-19 Coulombs C) 1.6 Coulombs D) 1 Coulomb
15. 15. Free to share, print, make copies and changes. Get yours at www.boundless.com Electric Charge and Field The SI of electric charge is A) Ampere B) Volt C) Coulomb D) Ohm
16. 16. Free to share, print, make copies and changes. Get yours at www.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/ Electric Charge and Field The SI of electric charge is A) Ampere B) Volt C) Coulomb D) Ohm
17. 17. Free to share, print, make copies and changes. Get yours at www.boundless.com Electric Charge and Field Electric charge in a closed system A) can be created or destroyed B) can be created but can not be destroyed C) can not be created or destroyed D) can not be be created but can be destroyed
18. 18. Free to share, print, make copies and changes. Get yours at www.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/ Electric Charge and Field Electric charge in a closed system A) can be created or destroyed B) can be created but can not be destroyed C) can not be created or destroyed D) can not be be created but can be destroyed
19. 19. Free to share, print, make copies and changes. Get yours at www.boundless.com Electric Charge and Field Charge separation can be created by A) friction B) all of these answers C) pressure D) heat
20. 20. Free to share, print, make copies and changes. Get yours at www.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/ Electric Charge and Field Charge separation can be created by A) friction B) all of these answers C) pressure D) heat
21. 21. Free to share, print, make copies and changes. Get yours at www.boundless.com Electric Charge and Field Charge separation can occur because electrons are A) negatively charged B) massless C) labile D) can not be transferred from atom to atom
22. 22. Free to share, print, make copies and changes. Get yours at www.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/ Electric Charge and Field Charge separation can occur because electrons are A) negatively charged B) massless C) labile D) can not be transferred from atom to atom
23. 23. Free to share, print, make copies and changes. Get yours at www.boundless.com Wiktionary. "static electricity." CC BY-SA 3.0 http://en.wiktionary.org/wiki/static+electricity Electric Charge and Field an electric charge that has built up on an insulated body, often due to friction A) nucleus electrcity B) voltage C) static electricity D) discharge electricity
24. 24. Free to share, print, make copies and changes. Get yours at www.boundless.com Electric Charge and Field an electric charge that has built up on an insulated body, often due to friction A) nucleus electrcity B) voltage C) static electricity D) discharge electricity
25. 25. Free to share, print, make copies and changes. Get yours at www.boundless.com Wiktionary. "static electricity." CC BY-SA 3.0 http://en.wiktionary.org/wiki/static+electricity Electric Charge and Field an electric charge that has built up on an insulated body, often due to friction A) nucleus electrcity B) voltage C) static electricity D) discharge electricity
26. 26. Free to share, print, make copies and changes. Get yours at www.boundless.com Electric Charge and Field Electric charge is a physical property of matter created by an imbalance in the number of A) photons and electrons in a substance B) protons and neutrons in a substance C) protons and electrons in a substance D) atoms in a substance
27. 27. Free to share, print, make copies and changes. Get yours at www.boundless.com Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/ Electric Charge and Field Electric charge is a physical property of matter created by an imbalance in the number of A) photons and electrons in a substance B) protons and neutrons in a substance C) protons and electrons in a substance D) atoms in a substance
28. 28. Key terms • conductor A material which contains movable electric charges. (CC BY-SA 3.0) • coulomb In the International System of Units, the derived unit of electric charge; the amount of electric charge carried by a current of 1 ampere flowing for 1 second.Symbol: C (CC BY-SA 3.0) • dielectric An electrically insulating or nonconducting material considered for its electric susceptibility (i.e., its property of polarization when exposed to an external electric field). (CC BY-SA 3.0) • dipole moment The vector product of the charge on either pole of a dipole and the distance separating them. (CC BY-SA 3.0) • discharge the act of releasing an accumulated charge (CC BY-SA 3.0) • discharge the act of releasing an accumulated charge (CC BY-SA 3.0) • electric charge A quantum number that determines the electromagnetic interactions of some subatomic particles; by convention, the electron has an electric charge of -1 and the proton +1, and quarks have fractional charge. (CC BY-SA 3.0) • electric field A region of space around a charged particle, or between two voltages; it exerts a force on charged objects in its vicinity. (CC BY-SA 3.0) • electric field A region of space around a charged particle, or between two voltages; it exerts a force on charged objects in its vicinity. (CC BY-SA 3.0) • gravity Resultant force on Earth's surface, of the attraction by the Earth's masses, and the centrifugal pseudo-force caused by the Earth's rotation. (CC BY-SA 3.0) • insulator A substance that does not transmit heat (thermal insulator), sound (acoustic insulator) or electricity (electrical insulator). (CC BY-SA 3.0) • insulator A substance that does not transmit heat (thermal insulator), sound (acoustic insulator) or electricity (electrical insulator). (CC BY-SA 3.0) Free to share, print, make copies and changes. Get yours at www.boundless.com Electric Charge and Field
29. 29. • nucleus the massive, positively charged central part of an atom, made up of protons and neutrons (CC BY-SA 3.0) • nucleus the massive, positively charged central part of an atom, made up of protons and neutrons (CC BY-SA 3.0) • resistivity In general, the resistance to electric current of a material; in particular, the degree to which a material resists the flow of electricity. (CC BY-SA 3.0) • static electricity an electric charge that has built up on an insulated body, often due to friction (CC BY-SA 3.0) • static electricity an electric charge that has built up on an insulated body, often due to friction (CC BY-SA 3.0) • terminal velocity The speed at which an object in free-fall and not in a vacuum ceases to accelerate downwards because the force of gravity is equal and opposite to the drag force acting against it. (CC BY-SA 3.0) • voltage The amount of electrostatic potential between two points in space. (CC BY-SA 3.0) Free to share, print, make copies and changes. Get yours at www.boundless.com Electric Charge and Field