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Q. A nonconducting solid sphere of radius 2.80 cm carries a uniformly distributed positive charge of 8.70×10-9 C. Calculate the magnitude of the electric field at a point 1.60 cm away from the center of the sphere.

Q. A 75-m long train begins unknown uniform acceleration from rest.The front of the train has a speed of 23 m/s when it passes arailway worker who is standing 180m from where the front of the train started. What will the speed of the last car be as it passesthe worker?

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