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Q. Two 10-cm-diameter charged thin rings face each other, 20 cm apart. The left ring is charged to 20 nC and the right ring is charged to +20 nC. a. What is the electric field , both magnitude and direction, at the midpoint between the two rings? b. Calculate the force on a 1.0 nC charge placed at the midpoint?

Q. A 91 kg water skier floating in a lake is pulled from rest to a speed of 10 m/s in a distance of 26 m. What is the net force exerted on the skier, assuming his acceleration is constant?

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