$A$ current of $10\,A$ is passing through a long wire which has a semicircular loop of radius $20\,cm$ as shown in the figure. The magnetic field produced at the centre $P$ of the loop is:
- A$10\,\pi \mu T$
- B$5\,\pi \mu T$
- C$4\,\pi \mu T$
- D$2\,\pi \mu T$
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