The ratio of magnetic moment of two bar magnet is `13:5`. These magnets are held togather in a vibration magnetometer are allowed to oscillate in earth's magnetic field with like poles togather 15 oscillations per minute are made. What will be the frequency of oscillation of system if unlike poles are togather?

Options

A. `10 "oscillations"//"min"`
B. `15 "oscillations"//"min"`
C. `12 "oscillations"//"min"`
D. `(75)/(13) "oscillation"//"min"`

Answer

A

Explanation

`M_(1)/M_(2)=(v_(s)^(2)+v_(d)^(2))/(v_(s)^(2)-v_(d)^(2))implies13/5=((15)^(2)+v_(d)^(2))/((15)^(2)-v_(d)^(2))`