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You have a disk with a radius of .1 m and generate negative charges by rubbing...

You have a disk with a radius of .1 m and generate negative charges by rubbing 2 electrostatic materials which are transferred to the disk. The surface charge density at the disk for the negative charges is -3.0x10^-6 C/m^2. How many electrons were generated and what is the electric field 0.001 m above the surface at a point near the center?

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