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Two wires have the same length and the same resistance but are made up of different materials. The resistivities of these materials are 3.97 Ù and 1.97 Ù. Obtain the ratio of the smaller cross-sectional area to the greater cross-sectional area.

  • Physics -

    Resistance R = r1* l/a1 = r2*l/a2 where r1 & r2 are resistivies of two wires.
    So a1/a2 = r1/r2

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