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I think the given solution is incorrrect

PLEASE SEE AND CHECK WHETHER IT IS crrct or not also i think the formula to be used is alos inccrct

$MagnticfielsBatcentreofcircularcoil=\frac{{\mu}_{0}2\pi {I}_{1}}{4\pi \times 2R}for1stcoil\phantom{\rule{0ex}{0ex}}hereradiusis2R\phantom{\rule{0ex}{0ex}}For2ndcoil=\frac{{\mu}_{0}2\pi {I}_{2}}{4\pi R}\phantom{\rule{0ex}{0ex}}For0Batcentretheyshouldbeequalandoppositeso\phantom{\rule{0ex}{0ex}}I2=I1/2\phantom{\rule{0ex}{0ex}}Hopethisinformationwillclearyourdoubtsabouttopic.\phantom{\rule{0ex}{0ex}}Ifyouhaveanymoredoubtsjustaskhereontheforumandourexpertswilltrytohelpyououtassoonaspossible.\phantom{\rule{0ex}{0ex}}Regards$

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