The magnetic field at the centre of a circular coil of radius r, due to current I flowing through it, is B. The magnetic field at a point along the axis at a distance ${r \over 2}$ from the centre is :

Question

B/2

${\left( {{2 \over {\sqrt 5 }}} \right)^3}B$

${\left( {{2 \over {\sqrt 3}}} \right)^3}B$

Solution

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