Question

Two bar magnets are bound together side by side and suspended. They swing in `12s` when their like poles are together and in `16s` when their unlike poles are together, the magnetic moments of these magnets are in the ratio
A. `27:5`
B. `25:7`
C. `7:25`
D. `24:7`

Answer 1

Correct Answer - B
`T=2pisqrt((I)/(MB_(H)))` and `(T_(1))/(T_(2))=sqrt((M_(1)-M_(2))/(M_(1)+M_(2))`