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    • Thread Starter

    I've got a question which says a 1.00m length of wire is stretched by 5% but the volume and resistivity stay the same.If the original diameter was 0.36mm,calculate the new cross-sectional area.

    Any help is greatly appreciated.

    You have the original length and Xsection area (from the diameter) so you can calculate the volume of the wire.
    After stretching you know the new length of wire is 1.05m (a 5% increase)
    You know the volume is the same as before so use this to find the new cross section area.
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