2A current is flowing in a circular coil of ‘n’ turn, having 10cm radius. The flux density at its centre is 0.126 × 10^–2 wb/m². The value of ‘n’ is

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100

1000

answer is B.

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Detailed Solution

$\begin{array}{l} B = \frac{μ_{0} ni}{2 r} \\ n = \frac{B \times 2 r}{μ_{0} i} = \frac{0 .126 \times 10^{- 2} \times 2 \times 10 \times 10^{- 2}}{4 π \times 10^{- 7} \times 2} = 100 \end{array}$

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