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Q. Grains of sand of mass 2.70 10-3 g each, fall from a height of 0.9 m on a sticky surface at a rate of 56 grains per second per cm2. What pressure does this shower of sand exert on the surface, assuming that air resistance can be neglected?

Q. Assume that at some point just outside the surface of the conductor, the electric field has magnitude and is directed toward the surface of the conductor. What is the charge density on the surface of the conductor at that point?

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