Two magnets have their lengths in the ratio `2:3` and their pole strength in the ratio `3:4`. The ratio of their magnetic moment is

Options

A. `4:1`
B. `1:2`
C. `1:4`
D. `2:1`

Answer

B

Explanation

`(l_(1))/(l_(2))=(2)/(3),(m_(1))/(M_(2))=(3)/(4)'(M_(1))/(M_(2))=?`
`(M_(1))/(M_(2))=(l_(1))/(l_(2))xx(m_(1))/(M_(2))=(2)/(3)xx(3)/(4)=(1)/(2)`