What is the electric potential energy of the system. a man, Ask an Expert

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Q. Three equal point charges, each with charge 1.70 , are placed at the vertices of an equilateral triangle whose sides are of length 0.300 . What is the electric potential energy of the system?

Q. A man strikes a long aluminum rod at one end. Another man, at the other end with his ear close to the rod, hears the sound of the blow twice (once through the air and once through the rod), with a 268 ms interval between them. How long is the rod?

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