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Q. An electric field of 7.5 multiplied by 105 V/m is needed between two parallel plates, each of area 39 cm2 and separated by 2.45 mm of air. What charge should be on each plate?

Q. A train is travelling up a 3.2 degree incline at a speed of 3.25 m/s when the last car breaks free and begins to coast. How long does it take for the last car to come to rest?

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