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A length of wire carries a steady curren...

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

A

a quarter of its first value

B

unaltered

C

four times of its first value

D

a half of its first value

Text Solution

Verified by Experts

The correct Answer is:
C
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