The resistance R of a wire varies directly as its length L and inversely as the square of its diameter d. (a) Write an equation that expresses this joint variation. (Use k for the constant of proportionality.) R= k (L/d^2) (b) Find the constant of proportionality if a wire 1.2 m long and 0.005 m in diameter has a resistance of 130 ohms. (Round your answer to six decimal places.) k =

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