Chapter+32

​**Key Definitions** **: **  **Pictures:**
 * 1) __inverse square law-__ A physical quantity varies inversely as another quantity squared
 * 2) __conservation of charge-__ The principal that net electric charge is neither created or destroyed but is transferable from one material to another
 * 3) __insulator-__ A material that is a poor conductor of electricity
 * 4) __conductor-__ A material which heat can be transferred
 * 5) __electrostatics-__ The study of electric charges at rest
 * Notes:**
 * Electrostatics involves electric charges, the forces between them, and their behavior in materials.
 * Coulomb's Law states that for charged paticles or objects that are small compared with the distance between them, the force between the charges varies directly as the product of the charges and inversely as the square of the distance between them.
 * When electrons can easily move in a material it is a good conductor. On the other hand, when electrons are tightly bound in a material that is a good insulator.
 * When a material can act as both a conductor or insulator it is a semiconductor.
 * At temperatures near absolute zero some metals acquire infinite conductivity, the metal is called a superconductor.
 * One side of the atom or molecule is induced to be slightly more positive or negative than the opposite side. The atom or molecule is said to be electrically polarized.
 * The quantity of charge on a body (represented by the letter **//q//** ) is determined by the number of electrons in excess of ( or less than) the number of protons.
 * There are three ways to charge an object. You can do this by induction, contact, or frictioin.
 * To charge something by contact, you start with a charged object and then transfer the energy into a conductor by touching the objects.
 * Charging an object without direct contact is called induction.
 * Electrical forces are billions apon billions of times stronger then the force of gravity, and can compress you to the size of the thickness of a piece of paper
 * Neutrons, Electrons and Protons are part of an atom.
 * A neutron has a neutral charge, electrons have a negative charge, and protons have a positive charge
 * Like charges repel and opposite charges attract


 * [[image:http://ts2.mm.bing.net/images/thumbnail.aspx?q=108432922861&id=963a9b244c7354f3c350fc87e64c939d&index=ch1&url=http%3a%2f%2fwww.faqs.org%2fphoto-dict%2fphotofiles%2flist%2f976%2f1431paper_cups.jpg width="128" height="168" caption="These cups are an example of an insulator of electricity"]] ||
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[|electrostatics- phun physics] _ extra notes
 * Links: **

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a.charge can be created and destroyed b.charge cannot be created or destroyed only transferred c. charge is nontransferrable and can only be created 3. T or F The quantity of charge is measured in joules 4. examples of good conductors are a. metals b. rubber c. glass 5. T or F A semi conductor can act as both a conductor and an insulator 6. T or F In a neutral atom, there are as many electrons as protons. 7. T or F Super conductor material does not offer infinite conductivity 8. T or F If the atom has one more positive charge than negative charge it is said to be positive 9. T or F An imbalance comes about by adding or subtracting electrons 10. What statement about atoms is false? a. Al electrons are identical b. All electrons are indentical c. The nucleus is composes of protons and electrons d. since atoms have as many electrons as protons, the atom has zero net charge
 * Test Questions: **
 * 1) T or F Like charges propel, and opposite charges attract.
 * 2) The Conservation of charge

**Record the aswers to the above questions at the link below** Answers to Test Questions