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  4. The strength of the magnetic field around a long straight wire, carrying current, is

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Q. The strength of the magnetic field around a long straight wire, carrying current, is

NTA AbhyasNTA Abhyas 2022

Solution:

The strength of magnetic field around a straight current carrying wire is given by
$B=\frac{\mu _{0}}{2 \pi } \, .\frac{I}{r}$
$\therefore \, \, B \propto \frac{1}{r}$
Therefore, magnetic field due to a straight current carrying wire is inversely proportional to the distance from the wire.