Two bar magnets of magnetic moments `12Am^(2)` and `10Am^(2)` are placed one over the other .First with their similar poles in contact after unlike poles in contact.The ratio of their resultant magnetic moments is

Options

A. `5:6`
B. `6:5`
C. `11:1`
D. `10:12`

Answer

C

Explanation

`M_(1)=12 Am^(2),M_(2)=10 Am^(2),(M_(s))/(M_(d))=?`
`(M_(s))/(M_(d))=(M_(1)+M_(2))/(M_(1)-M_(2))=(22)/(2)=(11)/(1)`