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Two very long, parallel, and oppositely charged wires of length L, radius r and their centers...

Two very long, parallel, and oppositely charged wires of length L, radius r and their centers separated by a distance D, so that r << D and D << L carry charge Q, Assuming the charge is distributed uniformly on the surface of each wire, Determine the following in term of the given quantities and fundamental constants: a. The Electric field at the mid-point between the wires; b. The potential difference between wires; c. The capacitance per unit of length of the pair.

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