Magnetic fields at two points on the axis of a circular coil at a distance of \(\ 0.05 \mathrm{~m} \) and 0.2 \(\ \mathrm{m} \) from the centre are in the ratio \(\ 8: 1\). The radius of coil is:

[JEE Main 2021, 25 Feb (Shift 1)]

Question

Magnetic fields at two points on the axis of a circular coil at a distance of \(\ 0.05 \mathrm{~m} \) and 0.2 \(\ \mathrm{m} \) from the centre are in the ratio \(\ 8: 1\). The radius of coil is:

[JEE Main 2021, 25 Feb (Shift 1)]

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Magnetic fields at two points on the axis of a circular coil at a distance of \(\ 0.05 \mathrm{~m} \) and 0.2 \(\ \mathr…

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