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A long straight wire carries a steady current. It is bent first to form a circular plane coil of one turn. The same wire is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is

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a quarter of its first value

unaltered

four times of its first value

half of its first value

answer is C.

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Detailed Solution

$B = \frac{μ_{o} nI}{2 r}$

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