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A bar magnet takes pi/10 seconds to comp...

A bar magnet takes `pi`/10 seconds to complete one oscillation in uniform magnetic field. The moment of inertia of the magnet about the axis of rotation is `1.2 xx 10^(-4) kgm^2` and the earth's horizontal magnetic field is 30`mu` T. The magnetic moment of the magnet is

A

`1200 Am^2`

B

`800 Am^2`

C

`1600 Am^2`

D

`1800 Am^2`

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AAKASH SERIES-APPENDICES ( REVISION EXERCISE )-REVISION EXERCISE (MAGNETISM AND MATTER )
  1. A bar magnet of magnetic moment 2.0 A m^2 is free to rotate about a ve...

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  2. A short bar magnet placed with its axis at 30^@ with a uniform externa...

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  3. A bar magnet takes pi/10 seconds to complete one oscillation in unifor...

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  4. A small magnet of moment 4.8 xx 10^(-2) J/T is suspended freely in t...

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  5. A short bar magnet used in a vibration magnetometer is heated so as to...

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  6. A compass needle makes 10 oscillations per minute in the earths horizo...

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  7. The magnetic needle of a vibration magnetometer makes 12 oscillations ...

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  8. A combination of two identical bar magnets are placed one over the oth...

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  9. A small magnetic needle performs 10 oscillations/minute in the earth's...

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  10. The time period of oscillation of a magnet in a vibration magnetometer...

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  11. A small magnetic needle performs 10 oscillations/minute in the earth's...

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  12. Two short bar magnets of magnetic moments m each are arranged at the o...

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  13. A small magnetic needle performs 10 oscillations/minute in the earth's...

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  14. A deflection magnetometer is adjusted in the usual way . When a magnet...

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  15. A short magnet oscillates in an oscillation magnetometer with a time p...

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  16. Two magnets are held in a viberation magnetometer and are allowed to o...

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  17. With a standard rectangular bar magnet, the time period of a vibration...

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  18. A magnet makes 40 oscilations per minute at a place having magnetic fi...

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  19. Obtain the earth's magnetisation, assuming that the earth's field can ...

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  20. The plane of a dip circle is set in the geographic meridian and the ap...

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