Chapter 19 Electric Charge and Electric Field l. Electric charge(电荷) It is an intrinsic character of the fundamental particles making up those objects 个物体能够吸引轻微的物体,这个物体就带有 电荷,也称带电体 It can be either positive or negative. Charges with the same sign repel each other and charges with opposite signs attract each other. That is: unlike charges attract, like charges repel(同号相斥,异号相吸).p457
Chapter 19 Electric Charge and Electric Field 1. Electric charge (电荷) It is an intrinsic character of the fundamental particles making up those objects. It can be either positive or negative. Charges with the same sign repel each other and charges with opposite signs attract each other. That is: unlike charges attract, like charges repel (同号相斥, 异号相吸). p457 一个物体能够吸引轻微的物体，这个物体就带有 电荷，也称带电体
Chapter 19 Electric Charge and Electric Field 2. Law of conservation of electric charge(p457) The net amount of electric charge produced in any process Is zero. 3. The sI unit of charge is the Coulomb. (p461) The si unit of charge is the coulomb(c). 4. Electric charge is quantized(p461) g=nel, where n is a positive or negative integer, and e is a constant of nature called the elementary charge(基本电荷).1|l=1.60×1019C 物体带电量都是基本电荷的整数倍。电荷的这种特 性叫电荷的量子性( quantized)
Chapter 19 Electric Charge and Electric Field The net amount of electric charge produced in any process is zero. 3. The SI unit of charge is the Coulomb. (p461) The SI unit of charge is the coulomb (C). 2. Law of conservation of electric charge (p457) 4. Electric charge is quantized (p461) q=n|e| , where n is a positive or negative integer, and e is a constant of nature called the elementary charge (基本电荷). 1|e|=1.60×10-19C. 物体带电量都是基本电荷的整数倍。电荷的这种特 性叫电荷的量子性(quantized)
Chapter 19 Electric Charge and Electric Field 5. Conductors and Insulators(p458) Conductors are materials in which some of negative charge can move freel nonconductors (insulators) semiconductors, superconductors 6. The methods to get electric charges p459-460 1) Charged due to rubbing(摩擦起电) 电荷从一个物体,转移到另一个物体
Chapter 19 Electric Charge and Electric Field Conductors are materials in which some of negative charge can move freely. 5. Conductors and Insulators(p458) nonconductors（insulators）， semiconductors， superconductors 6. The methods to get electric charges p459-460 电荷从一个物体，转移到另一个物体。 1) Charged due to rubbing (摩擦起电)
Chapter 19 Electric Charge and Electric Field 2) Induced Charge(感应起电) A positively charged object is brought close to a neutral Neutral metal rod metal rod Charges move and leave a positive charge at the opposite end metal rod still neutral. but with a separation of charge It is said to be induced感应. 6006+
Chapter 19 Electric Charge and Electric Field 2) Induced Charge (感应起电) A positively charged object is brought close to a neutral metal rod. Neutral metal rod metal rod still neutral, but with a separation of charge Charges move and leave a positive charge at the opposite end. It is said to be induced (感应)
Chapter 19 Electric Charge and Electric Field KaS19-5. Coulomb's Law (P460-P464) ok 库仑(C.A,Cou1omb 1736-1806)
Chapter 19 Electric Charge and Electric Field 19-5. Coulomb's Law (P460-P464)