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Q.

The electric current in a circular coil of two turns produced magnetic induction of 0.2T at its centre. The coil is unwound and rewound in to a coil of four turns. The magnetic induction at the centre of the coil now is, in tesla (if the same current flows in the coil)

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answer is 0.8.

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Detailed Solution

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$\begin{array}{l} {Bαn}^{2} \Rightarrow \frac{B_{2}}{B_{1}} = (\frac{4}{2}) \\ B_{2} = 4 B_{1} \\ = 0 .8 T . \end{array}$

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