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A wire 4.15 m long and 5.18 mm in diameter has a resistance of 21.0 mQ. A potential difference of 19.5 V is applied between

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A wire 4.15 m long and 5.18 mm in diameter has a resistance of 21.0 mQ. A potential difference of 19.5 V is applied between the ends. (a) What is the current in amperes in the wire? (b) What is the magnitude of the current density? (c) Calculate the resistivity of the material of which the wire is made. (a) Number Units (b) Number Units (c) Number i Units V

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