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Electric charges of the same sign

Learn about the behavior of electric charges and the law of conservation of charge. Understand conductors, insulators, charging experiments, and induced atomic dipoles.

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Electric charges of the same sign

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  1. Electric charges of the same sign • attract each other. • repel each other. • exert no forces on each other.

  2. Law of Conservation of Charge • The amount of charge in any closed system is always constant.

  3. True or False: Charge can never be created or destroyed.

  4. Electron-positron annihilation http://hyperphysics.phy-astr.gsu.edu/hbase/particles/imgpar/annih.gif Positron(Electron) charge: (-)e = (-)1.6022 x 10-19 Coulombs

  5. Conductors and Insulators • With rare exception, a material is either a conductor or an insulator. • A conductor has some mobile charges that can flow easily. • In an insulator, little or no charge can flow.

  6. A charged rod is brought near (but does not touch) a neutral conducting sphere. • The sphere is attracted towards the rod. • The sphere is repelled from the rod. • The sphere doesn’t move. • The answer depends on the charge of the rod.

  7. Electroscope http://www.engr.uky.edu/~gedney/courses/ee468/expmnt/escope.html

  8. If you bring a positively charged insulator near two uncharged metallic spheres that are in contact and then separate the spheres, the sphere on the right will have 1) no net charge. 2) a positive charge. 3) a negative charge.

  9. A charged rod is brought near (but does not touch) a neutral insulating sphere. • The sphere is attracted towards the rod. • The sphere is repelled from the rod. • The sphere doesn’t move. • The answer depends on the charge of the rod.

  10. Induced atomic dipole

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