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4. An infinitely long straight conductor is bent into the shape as shown in the figure. It carries a current of i ampere and the radius of the circular loop is r metre. Then the magnetic induction at its centre will be

(a) $\frac{{\mu }_{0}}{4\mathrm{\pi }}\frac{2i}{r}\left(\mathrm{\pi }+1\right)$
(b) $\frac{{\mu }_{0}}{4\mathrm{\pi }}\frac{2i}{r}\left(\mathrm{\pi }-1\right)$
(c) Zero
(d) Infinite