Question: A current I flows in an infinity long wire with cross section in the from of a semicircular ring of radius $R$. the magnitude of the magnetic induction along its axis is :-
$\frac{\mu_{0} I}{2 \pi R}$
$\frac{\mu_{0} I}{4 \pi R}$
$\frac{\mu_{0} I}{\pi^{2} R}$
$\frac{\mu_{0} I}{2 \pi^{2} R}$
Correct Option: , 3
Solution:
