In a wire of circular form has 4A current is flowing to have a magnetic induction as 1µT , at its centre. The radius of circle should be approximately

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2.5mm

25cm

2.5m

2.5cm

answer is A.

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Detailed Solution

$\begin{array}{l} B = \frac{μ_{0} i}{2 r} \\ \Rightarrow 10^{- 6} = \frac{4 π \times 10^{- 7} \times 4}{2 \times r}, r = 8 \times 10^{- 1} πm = 2 .5 m \end{array}$

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