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A 1.0--diameter oil droplet (density 900 kg/m^3) is negatively charged with the addition of 28 extra electrons. It is released from rest 2.0 mm from a very wide plane of positive charge, after which it accelerates toward the plane and collides with a speed of 3.3m/s

Part A What is the surface charge density of the plane?

? = _______ units

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