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    Magnetic Field of a Long Straight Wire

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    At what distance from a long, straight wire carrying a current of 100.0 A is the magnetic field due to the wire equal to the strength of the Earth's field, approximately 4.0E-5 T (in m)?

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    Solution Preview

    The magnetic field of a very long (infinite) wire is:


    mu is the permiability constant, ...

    Solution Summary

    Solution is calculated using the formula for the magnetic field of a very long (infinite) wire: B=(mu*I)/(2*Pi*r).