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A length of wire carries a steady curren...

A length of wire carries a steady current. It is first bent to form a circular coil of one turn. The same length is now bent more sharply to give a loop of two turns of smaller radius. The magentic field at the centre caused by the same current now will be

A

a quarter of its first value

B

same as that of the first value

C

four times the first value

D

double of its first value

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