Correct Answer - C
Resistance of ring of angle `300^(@),R_(1)=(5R)/(6)`
Resistance of ring of angle `60^(@), R_(2)=R/6`
`i_(1)=(R_(2))/(R_(1)+R_(2)) i=i/6, i_(2)=i-i/6=(5i)/6`
`B_(1)=(mu_(0)i_(1))/(2a)xx(300^(@))/(360^(@))=(5mu_(0)i)/(72a), ox`
`B_(2)=(mu_(0)i_(2))/(2a)xx(60^(@))/(360^(@))=(5mu_(0)i)/(72a), o.`
`(B_(1))/(B_(2))=1`