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16 May, 13:10

A very long straight current-carrying wire produces a magnetic field of 25 µT at a distance d from the wire. How far will the magnetic field due to this wire be 2.8 µT.

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  1. 16 May, 13:24
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    The magnetic field strength of a very long current-carrying wire is proportional to the inverse of the distance from the wire. The farther you go from the wire, the weaker the magnetic field becomes.

    B ∝ 1/d

    B = magnetic field strength, d = distance from wire

    Calculate the scaling factor for d required to change B from 25μT to 2.8μT:

    2.8μT/25μT = 1/k

    k = 8.9

    You must go to a distance of 8.9d to observe a magnetic field strength of 2.8μT
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