Two magnets of same size and mass make respectively 10 and 15 oscillations per minute at certain place. The ratio of their magnetic moment is

Options

A. `4:9`
B. `9:4`
C. `2:3`
D. `3:2`

Answer

A

Explanation

`T=2pisqrt(1/(MB_(H)))impliesT_(1)/T_(2)=sqrt(M_(2)/M_(1))`
`implies M_(1)/M_(2)=T_(2)^(2)/T_(1)^(2)=((60//15)^(2))/((60//10)^(2))=4/9`