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Nine identical wires, each of diameter d and length L, are connected in series. The combination has the same resistance as a single similar wire of length L but whose diameter is: 9 d 3 d d/3 d/9 d/81

Nine identical wires, each of diameter d and length L, are connected in series. The combination has the same resistance as a single similar wire of length L but whose diameter is: 9 d 3 d d/3 d/9 d/81

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Nine identical wires, each of diameter d and length L , are connected in series. The combination has the same resistance as a single similar wire of length L but whose diameter is: 9 d 3 d d / 3 d / 9 d / 81

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