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A short bar magnet of magnetic moment 2A...

A short bar magnet of magnetic moment `2Am^(2)` and moment of inertia `6xx10^(2)kgm^(2)` is freely suspended such that the magetic axial line is in the direction of magnetic meridian. If the magnet is displaced by a very small angle `(3^(0))`,the angular acceleration is `-x10^(-6)rad//sec^(2)` (Magnetic induction of earth's horizontal field `=4xx10^(-4)T`).

A

`pi//20`

B

`pi//45`

C

`pi//60`

D

`pi//75`

Text Solution

Verified by Experts

The correct Answer is:
B
`alpha=-((MB_(H))/I)theta`
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NARAYNA-MAGNETISM AND MATTER-EXERCISE - 2 (C.W)
  1. A bar magnet is placed with its North pole pointing North. Neutral poi...

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  2. The period of a thin magnet in a magnetic field is 2s. It is cut into ...

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  3. A bar magnet suspended in magnetic meridian executes oscillations with...

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  4. Two bar magnets are bound together side by side and suspended. They sw...

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  5. A short bar magnet is oscillating in a magnetic field and its time per...

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  6. When two identical bar magnets placed one above the other, such that t...

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  7. A bar magnet suspended freely in uniform magnetic field is vibrating w...

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  8. A short bar magnet of magnetic moment 2Am^(2) and moment of inertia 6x...

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  9. The period of oscillation of a magnet at a place is 4seconds. When it ...

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

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  11. The magnetic needle of a V.M.M completes 10 oscillations in 92seconds....

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  12. A magnetic needle has a frequency of 20 oscillations per minute in the...

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  13. A thin iron rod is cut into 10 equal parts parallel to its length. The...

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  14. The dipole moment of each molecule of a paramagnetic gas is 1.5xx10^(-...

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  15. A paramagnetic sample shows a net magnetisation of 8Am^-1 when placed ...

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  16. The angle of dip at a place is 40.6^(@) and the intensity of the verti...

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  17. The correct value of dip angle at a place is 45^(@). If the dip circle...

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  18. A compass needle oscillates 20 times per minute at a place where the d...

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  19. The real angle of dip, if a magnet is suspended at an angle of 30^(@) ...

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  20. At a place the value of B(H) and B(V) are 0.4xx10^(-4)T and 0.3xx10^(-...

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