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A. Four charged particles are arranged in a diamond around the origin. There is a +2nc charge located at 4mx, a -8nC charge located at 5my, -6nC charge located at -4mx and a fourth charge located at -5my. What should the fourth charge be so that the voltage at the origin is zero?
B. What is the electric field at the origin. Is it surprising that it is not zero?
Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 12 m/s at an angle 49 degrees; What is the maximum height the ball goes above the ground
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