A wire carrying a current of 140 ampere is bent into the form of a circle of radius \( 6 \mathrm...

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A wire carrying a current of 140 ampere is bent into the form of a circle of radius \( 6 \mathrm{~cm} \). The flux density at a distance of \( 8 \mathrm{~cm} \) on the axis passing through the centre of the coil and perpendicular to its plane is (in \( \mathrm{Wb} / \mathrm{m}^{2} \) (approximately))
a. \( \pi \times 10^{-4} \)
b. \( 2 \pi \times 10^{-4} \)
c. \( \frac{\pi}{2} \times 10^{-4} \)
d. \( \frac{1}{\pi} \times 10^{-4} \)
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