Magnetic field due to $0.1\, A$ current flowing through a circular coil of radius $0.1\, m$ and $1000$ $turns$ at the centre of the coil is
AIPMT 1999, Easy
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(c) $ B = \frac{{{\mu _0}Ni}}{{2r}} = \frac{{4\pi \times {{10}^{ - 7}} \times 1000 \times 0.1}}{{2 \times 0.1}} = 6.28 \times {10^{ - 4}}\,T$
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