A portion of a conductive wire is bent in the form of a semicircle ...

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A portion of a conductive wire is bent in the form of a semicircle of radius \( r \) as shown below in fig. At the centre of semicircle, the magnetic induction will be
(a) zero
(b) infinite
(c) \( \frac{\mu_{0}}{4 \pi} \cdot \frac{\pi \mathrm{i}}{\mathrm{r}} \) gauss
(d) \( \frac{\mu_{0}}{4 \pi} \cdot \frac{\pi \mathrm{i}}{\mathrm{r}} \) tesla
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