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Posted by on Monday, July 15, 2013 at 3:31am.

You have a piece of copper with a volume of 2 cm3, and wish to form a wire having a resistance of
0.15 ƒ¶. How long should the wire be if the resistivity of copper is 1.72 ~ 10-8 ƒ¶. m?

  • Physics - , Monday, July 15, 2013 at 1:07pm

    R=ρL/A = ρL²/V
    L=sqrt{RV/ρ} =
    =sqrt{ 0.15•2•10⁻⁶/1.72•10⁻⁸} = 4.17 m

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