Q.

A wire of length ‘l’ is bent into a circular loop of radius R and carries a current I. The magnetic field at the centre of the loop is ‘B’. The same wire is now bent into a double loop. If both loops carry the same current I and it is in the same direction, the magnetic field at the centre of the double loop will be

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a

zero

b

4 B

c

8 B

d

2B

answer is C.

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Detailed Solution

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l=n×2πrrln(1)B=μ0ni2rBnr(2)
from (1) and (2) ,Bn2
B1B2=n1n22;BB2=n2n2;B2=4B

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