Class 12PhysicsMagnetism and MatterMagnetic Equipment's (Tangent galvanometer, Vibration magnetometer and Neutral point)
DifficultTwo 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
- A$4:3$
- B$25:7$
- C$7:5$
- D$25:16$
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