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10. Consider two long, parallel, and oppositely charged wires of radius R with their centers separated by a distance D that is much larger than R. Assume that the charge is uniformly distributed on the surface of each wire. Following the steps outlined in problem 9, (a) express the electric field, in unit vector notation, between the two wires, but outside either wire. (b) Work out the voltage difference between the surfaces of the wires. (c) Derive an expression for the capacitance per unit length L of wire of this system in terms of D,R.E0. How does this expression simplify, if D>>R?

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