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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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Bαn2⇒B2B1=42B2=4B1=0.8T.

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