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A bar magnet of magnetic moment 2.0 A m^...

A bar magnet of magnetic moment `2.0 A m^2` is free to rotate about a vertical axis through its centre. The magnet is released from rest from the east-west position. Find the kinetic energy of the magnet as it takes the north-south position. The horizontal component of the earth's magnetic field is `B = 25 muT`.

A

`25 mu J`

B

`50 mu J`

C

`100 mu J`

D

`12.5 mu J`

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

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

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

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

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

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

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

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

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

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

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