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6. A proton is fixed at a point. A second proton is released from rest at a point 2 nm from the first proton. What is its kinetic energy when it is 4 nm from the first proton? 7. Four charges, +5 μ C each, are at the corners of a square whose sides are 2 m. What is the potential at the center of the square?

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un 2. 2-7 hy a n 442

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