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WHomework set 1_solns_2011

# WHomework set 1_solns_2011 - Webassign Homework set 1...

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Webassign Homework set # 1 Problems: 1, 4, 10, 11, 13, 14 Solutions: 15.1 Since the charges have opposite signs, the force is one of attraction . Its magnitude is  9 9 2 1 2 9 8 2 2 2 4.5 10 C 2.8 10 C N m 8.99 10 1.1 10 N C 3.2 m e k q q F r 15.4 The attractive forces exerted on the positive charge by the negative charges are shown in the sketch and have magnitudes 1 2 2 2 2 3 2 2 2 and 2 2 e e e k q k q k q F F F a a a 2 2 2 2 3 2 2 2 cos45 0.707 1.35 2 e e e x k q k q k q F F F a a a   and 2 2 2 1 3 2 2 2 sin45 0.707 1.35 2 e e e y k q k q k q F F F a a a   2 2 2 2 1.91 e R x y k q F F F a   and   1 1 tan tan 1 45 y x F F so 2 2 1.91 along the diagonal toward the negative charge e R k q a

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