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What You Need to Know For the TestDefine electric charge. Describe the behaviors between electric charges. Distinguish between conductors and insulators. Distinguish among charging by friction, by contact, and by induction. Describe how neutral objects may be attracted to charged objects by charge polarization. Recognize that electrons are free to move in a solid conductor, but that protons stay put. Use Coulomb’s law to solve problems involving forces between multiple charges. Interpret the electric field based on electric field lines. Sketch electric field lines for simple charge distributions (isolated + charge; isolated – charge; +,- charges; -,- charges; +,+, charges). Calculate electric field strength and direction due to point charges.
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