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A bar magnet of moment of inertia 1xx10^...

A bar magnet of moment of inertia `1xx10^(-2)kgm^(2)` vibrates in a magnetic field of induction `0.36xx10^(-4)` tesla. The time period of vibration is `10s`. Then the magnetic moment of the bar magnet is `(Am^(2))`

A

120

B

111

C

140

D

160

Text Solution

Verified by Experts

The correct Answer is:
B
`M=4pi^(2)I/(T^(2)B)`
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NARAYNA-MAGNETISM AND MATTER-EXERCISE - 1 (C.W)
  1. A magnet of length 10 cm and magnetic moment 1Am^(2) is placed along t...

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  2. The length of a magnet of moment 5Am^(2) is 14cm. The magnetic inducti...

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  3. A pole of pole strength 80 Am is placed at a point at a distance 20cm ...

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  4. A short bar magnet produces manetic fields of equal induction at two p...

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  5. Two short bar magnets with magnetic moments 8Am^(2) and 27Am^(2) are p...

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  6. A short magnetic needle is pivoted in a uniform magnetic field of indu...

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  7. Two magnetic poles of pole strength 324 milli amp.m. and 400 milli amp...

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  8. With a standard rectangular bar magnet, the time period in the uniform...

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  9. A bar magnet of moment of inertia 1xx10^(-2)kgm^(2) vibrates in a magn...

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  10. Two bar magnets placed together in a vibration magnetometer take 3 sec...

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  11. A bar magnet of length 'I' breadth 'b' mass 'm' suspended horizontally...

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  12. The time period of a vibration magnetometer is T(0). Its magnet is rep...

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  13. A magnetic needle is kept in a uniform magnetic field of induction 0.5...

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  14. A magnet is suspended horizontally in the earth's field. The period of...

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  15. A magnet freely suspended makes 20 vibrations per minute at first plac...

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  16. A magnet has a dimensions of 25cmX10cmX5cm and pole strength of 200 mi...

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  17. The mass of iron rod is 110g, its magnetic moment is 20Am^(2). The den...

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  18. Relative permeability of iron is 5500, then its magnetic susceptibilit...

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  19. A specimen of iron is uniformly magnetised by a magnetising field of 5...

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  20. The magnetic susceptibility of a rod is 499. The absolute permeability...

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