The magnetic moment of a bar magnet is M. If it is cut into two pieces in the ratio 1:2 perpendicular to its length, what is the ratio of their magnetic moments.

Explanation

Given that, `l_1 : l_2 = 1:2`
New magnetic moment of first piece, `M_1 = (M)/(3)`
New magnetic moment of second piece, `M_2 = (2M)/(3)`
`:.` Ratio of magnetic moments, `(M_1)/(M_2)=(1)/(2)`.