A thin circular frame of radius $'a'$ is made of insulating material. A square loop is constructed with in it. If loop carrying current $I$ , then magnetic induction at geometrical centre $'O'$ will be
A thin circular frame of radius $'a'$ is made of insulating material. A square loop is constructed with in it. If loop carrying current $I$ , then magnetic induction at geometrical centre $'O'$ will be
- A
$\frac{{2{\mu _0}I}}{{\pi a}}$
- B
$\frac{{\sqrt 3 {\mu _0}I}}{{2\pi a}}$
- C
$\frac{{2\sqrt 2 {\mu _0}I}}{{\pi a}}$
- D
$\frac{{3\sqrt 3 {\mu _0}I}}{{2\pi a}}$
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