The magnetic needle of a vibration magne...

The magnetic needle of a vibration magnetometer makes 12 oscillations per minute in the horizontal component of Earth's magnetic field. When an external short bar magnet is placed at some distance along the axis of the needle in the same line, it makes 15 oscillations per minute. If the poles of the bar magnet are interchanged, the number of oscillations it makes per minute is

`sqrt( 61)`

`sqrt(63)`

`sqrt( 65)`

`sqrt(67)`

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The magnetic needle of a vibration magnetometer makes 12 oscillations per minute in the horizontal component of earth's magnetic field. When an external short bar magnet is placed at some distance along the axis of the needle in the same line it makes 15 oscillations per minute. If the poles of the bar magnet are inter changed, the number of oscillations it takes per minute is

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The combination of two bar magnets makes 20 oscillations per minute in an oscillation magnetometer when like poles are tied together and 5 oscillations per minute when unlike poles are kept together. Then ratio of the magnetic moment of magnets is

AAKASH SERIES-APPENDICES ( REVISION EXERCISE )-REVISION EXERCISE (MAGNETISM AND MATTER )

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