Two similar coils of radius R are lying concentrically with their planes at right angles to each other. The currents flowing in them are $I$ and 2$I$, respectively. The resultant magnetic field induction at the centre will be
${{\sqrt 5 {\mu _0}I} \over {2R}}$
${{\sqrt 5 {\mu _0}I} \over R}$
${{{\mu _0}I} \over {2R}}$
${{{\mu _0}I} \over R}$
Solution
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