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A magnet is parallel to a uniform magnet...

A magnet is parallel to a uniform magnetic field. The work done in rotating the magnetic through `60^(@) is 8xx10^(-5) J`. The work done in rotating through another `30^(@)` is

A

`4xx10^(-5)J`

B

`6xx10^(-5)J`

C

`8xx10^(-5)J`

D

`2xx10^(-5)J`

Text Solution

Verified by Experts

The correct Answer is:
C
`W=MB[costheta_(1)-costheta_(2)]`
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NARAYNA-MAGNETISM AND MATTER-EXERCISE - 1 (H.W)
  1. A short bar magnet placed with its axis at 30^(@) with a uniform exter...

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  2. When a bar magnet is placed at 90^(@) to a uniform magnetic field, it ...

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  3. A magnet of moment 4Am^(2) is kept suspended in a magnetic field of in...

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  4. The work done in rotating the magnet form the direction of uniform fie...

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  5. The work done in rotating a magnet of pole strength 1 A-m and length 1...

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  6. The work done in turning a magnet normal to field direction from the d...

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  7. A magnet is parallel to a uniform magnetic field. The work done in rot...

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  8. The magnetic induction field strength at a distance 0.2 m on the axial...

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  9. A short bar magnet of magnetic moment 1.2Am^(2) is placed in the magne...

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  10. A very long magnet of pole strength 4 Am is placed vertically with its...

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  11. A bar magnet of magnetic moment M and moment of inertial I is in the d...

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  12. If the moments of inertia of two bar magnets are same, and if their ma...

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  13. If the strength of the magnetic field is increased by 21% the frequenc...

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  14. A bar magnet has a magnetic moment equal to 65xx10^(-5) wever x metre....

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  15. Two bar magnets are placed in vibration magnetometer and allowed to vi...

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  16. The magnetic induction and the intensity of magnetic field inside an i...

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  17. The mass of an iron rod is 80 gm and its magnetic moment is 10 Am^(2)....

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  18. A rod of cross sectional area 10cm^(2) is placed with its length paral...

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  19. A bar magnet of magnetic moment 10Am^(2) has a cross sectional area of...

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  20. The variation of magnetic susceptibility (chi) with temperature for a ...

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