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a) A proton of mass mp = 1.67 x 10^-27 kg and charge +e = 1.60 x 10^-19 C is accelerated from rest through an electric potential of 290 kV. What is its final velocity?

b) The electric potential at the center of a square is -3 V when a charge of -Q is located at one of the square's corners. What is the electric potential at the square's center when identical charges of +Q are placed at the other three corners of the square?

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