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Chapter 32: Electrostatics

Chapter 32: Electrostatics. Examples of Electrostatics in the world are : A doorknob shock Static in the dryer Your hair standing up when combed. What is electrostatics? (644). Electricity at rest Involves electrical charges, the forces between them, and their behavior in materials.

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Chapter 32: Electrostatics

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  1. Chapter 32: Electrostatics Examples of Electrostatics in the world are: A doorknob shock Static in the dryer Your hair standing up when combed

  2. What is electrostatics? (644) • Electricity at rest • Involves electrical charges, the forces between them, and their behavior in materials

  3. What is a charge? (645) • Mutual attractions or repulsions between electrons or protons is called charge. • Charges can be negative (-) or positive (+)

  4. How are the following particles charged? • Protons= positively charged • Neutrons= no charge, not repelled or attracted to other particles • Electrons= negatively charged

  5. Like charges repelOpposite charges attract(645-646) • Draw a picture to represent the saying above.

  6. What is the conservation of charge? (647) • Law of conservation: the principle that electric charge can neither be created nor destroyed. The net quantity of electric charge, the amount of positive charge minus the amount of negative charge in the universe, is always conserved. • The first written statement of the principle was by American scientist and statesman Benjamin Franklin in 1747.

  7. Define conductor. (651) • Material in which an electrical charge can flow • Examples: copper, metal, your body, water

  8. Define insulator. (651) • Poor conductor for electricity • Examples: rubber, glass, cotton

  9. What are 2 ways electric charge can be transferred? (652) • Friction- rub hands together • Contact- touch another person or an object

  10. What is induction? (653) • Charging of an object without direct contact

  11. Define grounding. (654) • When we allow charges to move off (or onto) a conductor by touching it • Why and how do we ground the electricity in our house?

  12. When is an object electrically polarized? (655) • One side of the atom or molecule is induced to be slightly more positive (or negative) than the opposite side • Example: • Balloon and hair--- rub a balloon on hair for static • Neg(-) pos (+)

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