6B Ch 21 - Electric Charges Unlike gravity which is always...

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Electric Charges Unlike gravity, which is always attractive, there are forces which can be either attractive or repulsive. These forces act between electrical charges . Benjamin Franklin named the two types of charges positive and negative . Like charges repel, opposite charges attract.
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Quantization of Electric Charges • The electric charge, q, is said to be quantized – q is the standard symbol used for charge as a variable – Electric charge exists as discrete packets – q = N e • N is an integer • e is the fundamental unit of charge • |e| = 1.6 x 10 -19 C • Electron: q = -e • Proton: q = +e
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Coulomb ± s Law Charles Coulomb measured the magnitudes of electric forces between two small charged spheres He found the force depended on the charges and the distance between them
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Coulomb ± s Law • The SI unit of charge is the Coulomb, C • k e is called the Coulomb Constant – k e = 8.9875 x 10 9 N .
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