Ratio of the magnetic moments of two magnets of equal size and mass which make 12 and 15 oscillations respectively per minute at a place is :

12 : 15

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16 : 25

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3 : 5

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4 : 5

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Solution

The correct option is C 16 : 25
The time period of oscillation is given by
$T = 2 π \sqrt{\frac{I}{M B}}$
$\frac{f_{1}^{2}}{f_{2}^{2}} = \frac{M_{1}}{M_{2}}$
$\frac{M_{1}}{M_{2}} = \frac{16}{25}$

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Ratio of the magnetic moments of two magnets of equal size and mass which make 12 and 15 oscillations respectively per minute at a place is :

The correct option is C 16 : 25The time period of oscillation is given byT=2π√IMBf21f22=M1M2M1M2=1625

The correct option is C 16 : 25
The time period of oscillation is given by
$T = 2 π \sqrt{\frac{I}{M B}}$
$\frac{f_{1}^{2}}{f_{2}^{2}} = \frac{M_{1}}{M_{2}}$
$\frac{M_{1}}{M_{2}} = \frac{16}{25}$