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An aluminum bar 3.68 m long has a rectangular cross section 1.01 cm by 5.17 cm...

An aluminum bar 3.68 m long has a rectangular cross section 1.01 cm by 5.17 cm . a. What is it's resistance? (I got 1.987x10^-4 but the program says this is wrong) b. What is the length of a copper wire 1.50 mm in diameter having the same resistance? (I got 0.02041 but it also was wrong)

A 14.0 gauge copper wire of diameter 1.628 mm carries a current of 11.0 mA. What is the potential difference across a 2.25 m length of the wire? (answer: 2.05x10^-4) What would the potential difference in part A be if the wire were silver instead of copper, but all else was the same? ( I got 1.891x10^-4 and it was wrong)

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