A current of $10\,A$ is passing through a long wire which has semicircular loop of the radius $20\,cm$ as shown in the figure. Magnetic field produced at the centre of the loop is
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(b) $B = {10^{ - 7}} \times \frac{{\pi \times i}}{r} = {10^{ - 7}} \times \frac{{\pi \times 10}}{{20 \times {{10}^{ - 2}}}} = 5\pi \mu T$
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