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A length lof wire carries a steady curre...

A length lof wire carries a steady current i. It is bent first to form a circular plane coil of one turn . The same length is now bent more sharply to give three loops of smaller radius . The magnetic field at the centre caused by the same current is

A

quarter of its first value

B

unaltered

C

four times of its first value

D

half of its first value

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The correct Answer is:
C
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