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# The intensity of the magnetic induction field at the center of a single turn circular coil of radius 5 cm carrying current of $0.9A$:

$\begin {array} {1 1} (1)\;36 \pi \times 10^{-7}T & \quad (2)\;9 \pi \times 10^{-7} \\ (3)\;36 \pi \times 10^{-6}\;T & \quad (4)\;9 \pi \times 10^{-6} T \end {array}$

$(1)\;36 \pi \times 10^{-7}T$