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Q. Three equal 1.30-mu C point charges are placed at the corners of an equilateral triangle whose sides are 0.700 m long. What is the potential energy of the system? (Take as zero the potential energy of the three charges when they are infinitely far apart.)

Q. A ship sets out to sail to a point 194 km due north. An unexpected storm blows the ship to a point 106 km due east of its starting point. How far must it now sail to reach its original destination?

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