ch24_p96 - 96. A positive charge q is a distance r d from...

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96. A positive charge q is a distance r – d from P , another positive charge q is a distance r from P , and a negative charge – q is a distance r + d from P . Sum the individual electric potentials created at P to find the total: V q rd r rd = +− + L N M O Q P 4 111 0 π ε . We use the binomial theorem to approximate 1/( r – d ) for r much larger than d : 11 112
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