Physics - Magnetism Question with Solution | TestHub

The magnetic field at the centre of closed loop is

$B=\frac{{\mu }_{0}I}{2r}=\frac{4\pi \times 10^{-7}\times I}{2\times 5\times 10^{-2}}$

$\mathrm{\text{or}}0\text{.}70\times 10^{-4}=\frac{4\pi \times 10^{-7}\times I}{10\times 10^{-2}}$

$\therefore I=5\text{.}6\text{A}$