A current carrying conductor of length `l` is bent into two loops one by one. First loop has one turn of wire and the second loop has two turns of wire. Compare the magnetic fields at the centre of the loops

Explanation

In first case `I=2pir`, In second case `I.=2xx(2pir_(2))impliesr_(2)=r_(1)//2`
At centre `(B=9mu_(0)hati)/(2r_(1))" "B.=(2xxmu_(0)hati)/(2r_(2))` (`:.` thre are 2 turns)
`implies(B.)/B=(2r_(1))/(r_(2))=4`
`:.B.=4B`