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A total charge Q is uniformly distributed, with surface charge density, over a very thin disk...

A total charge Q is uniformly distributed, with surface charge density, over a very thin disk of radius R. The electric field at a distance d along the disk axis is given by E where n is a normal unit vector perpendicular to the disk. What is the best approximation for the electric field magnitude E at large distances from the disk?

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Answer #1

I derived a little derivation for your convenience at the starting of the solution , you may skip it :)

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