Question

In the figure shown there are two semicircles of radii {{r}_{1}}
and {{r}_{2}}
in which a current i is flowing. The magnetic induction at the centre O will be
A) \frac{{{\mu }_{0}}i}{r}({{r}_{1}}+{{r}_{2}}) B) \frac{{{\mu }_{0}}i}{4}({{r}_{1}}-{{r}_{2}}) C) \frac{{{\mu }_{0}}i}{4}\left( \frac{{{r}_{1}}+{{r}_{2}}}{{{r}_{1}}{{r}_{2}}} \right) D) \frac{{{\mu }_{0}}i}{4}\left( \frac{{{r}_{2}}-{{r}_{1}}}{{{r}_{1}}{{r}_{2}}} \right)

Answer 1

what is it? pls specify ques. correct