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Magnetic field induction at the center of a circular coil of radius 5 cm and carrying a current 0.9 A is (in SI units) ($\in _0$= absolute permittivity of air in SI units, velocity of light $= 3 \times 10^8 ms^{-1})$

\[\begin {array} {1 1} (a)\;\frac{1}{ \in_0 10^{16}} & \quad (b)\;\frac{10^{16}}{\in_0} \\ (c)\;\frac{\in_0}{10^{16}} & \quad (d)\;10^{16} \in_0 \end {array}\]
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