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  4. A current of one ampere is passed through a straight wire of length 2 metre. The magnetic field at a point in air at a distance of 3 m from one end of the wire but lying on the axis of the wire will be

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Q. A current of one ampere is passed through a straight wire of length 2 metre. The magnetic field at a point in air at a distance of 3 m from one end of the wire but lying on the axis of the wire will be

Moving Charges and Magnetism

Solution:

$B=\frac{\mu_0\,i}{2\pi\,r}$