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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 magnetic field at the centre caused by the same current now will be

A

A quarter of its first is

B

unaltered

C

four times of its first value

D

two times of its first value

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The correct Answer is:
C
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