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# Ch 20 1 Electric Charge & Static Electricity

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### Ch 20 1 Electric Charge & Static Electricity

1. 1. Electric Charge & Static Electricity 20.1 Chapter 20 Electricity
2. 2. What produces a net electric charge? <ul><li>Electric Charge = property that causes subatomic particles such as protons and electrons to attract or repel each other </li></ul><ul><li>Protons have positive charge (+) </li></ul>
3. 3. What produces a net electric charge? <ul><li>Electrons have negative charge (-) </li></ul><ul><li>Ex. Electric charge = lightning bolt or static cling </li></ul><ul><li>An XS or Shortage of electrons produces a net electric charge- ions </li></ul>
4. 4. What determines whether an electric force is attractive or repulsive? <ul><li>Electric Force = the attraction or repulsion between electrically charged objects </li></ul><ul><li>Like charges repel </li></ul><ul><li>Opposite charges attract </li></ul><ul><li>Double electric charge will double the electric force </li></ul><ul><li>In an atom Electric forces are stronger than gravity = chemical bond </li></ul>
5. 5. What determines the strength of an electric field? <ul><li>Electric field = is the space around an object with an electric charge </li></ul><ul><li>The strength of an electric field depends on: </li></ul><ul><li>The amount of charge that produces the field </li></ul><ul><li>On the distance from the charge </li></ul>
6. 6. What are three ways in which charge is transferred? <ul><li>Charges can be transferred by </li></ul><ul><li>Friction = Ex. Rub balloon on hair… Hair gives up Electron becoming (+) and balloon (-) </li></ul><ul><li>Contact = Van de Graff Generator — a charged metal sphere causes hair to repel each other </li></ul><ul><li>By Induction = Ex. When you walk across a carpet & touch door knob get a shock… </li></ul>
7. 7. How does a static discharge occur? <ul><li>Static discharge is the shock you feel when you touch a door knob. </li></ul><ul><li>Static discharge occurs when a pathway through which a charge can move forms suddenly. </li></ul><ul><li>When the gap between door and finger is small. </li></ul><ul><li>Lightning is the same but more dramatic </li></ul>