Q 1561834725.     Two bar magnets `A` and `B` are placed one over the other and are allowed to
Vibrate in a vibration magnetometer. They make `20` oscillations per minute when
the similar poles of `A` and `B` are on the same side, while they make `15` oscillations
per minute when their opposite poles lie on the same side. If `M_A` and `M_B` are the
magnetic' moments of `A` and `B` and if `M_A > M_B`, the ratio of `M_A` and `M_B` is

BITSAT 2009
A

`4: 3`

B

`25:7`

C

`7: 5`

D

`25: 16`

HINT

` M_A/M_B = (T_d^2 + T_s^2)/(T_d^2 - T_s^2) `

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