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Electric field and potential due to a circular charged disc

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Consider a circular disk with radius R that has a uniformly distributed surface charge of Q.

(a) Calculate the electric potential (Phi) at various points along the central axis of this disk.

(b) Use the result of part (a) to determine the electric field at points along the axis.

(c) Show that your results for both parts reduce to the appropriate formula in the limit that R tends to infinity.

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