Two concentric and co planer circular conducting rings are shown in figure. If b >> a and current I is flowing in the ring I then flux of magnetic field through ring 2 is
| A. |
`(mupiIb^2)/(2a)` |
| B. |
`(mu_0Ib)/2` |
| C. |
`(mupiIa^2)/(2b)` |
 |
| D. |
`(mupiIa)/(2b^2)` |