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A wire of length l carries a steady curr...

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

A

B

B

2B

C

4B

D

B/2

Text Solution

Verified by Experts

The correct Answer is:
C
`B_(2) = n^(2)B_(1)`
Here `n = 2, B_(1) = B`,
`B_(2) = 4B`
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