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A circular coil of wire consisting of 100 turns each of radius \( 9 \mathrm{~cm} \) carries a current of \( 0.4 \mathrm{~A} \). The
\( \mathrm{P} \)
W magnitude of magnetic field at the centre of the coil is
(a) \( 2.4 \times 10^{-4} \mathrm{~T} \)
(b) \( 3.5 \times 10^{-4} \mathrm{~T} \)
(c) \( 2.79 \times 10^{-4} \mathrm{~T} \)
(d) \( 3 \times 10^{-4} \mathrm{~T} \)
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