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The work done in rotating a bar magnet f...

The work done in rotating a bar magnet f magnetic moment M from its unstable equilibrium positon to its stable equilibrium position in a uniform magnetic field B is

A

`2MB`

B

`MB`

C

`-MB`

D

`-2MB`

Text Solution

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The correct Answer is:
D
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AAKASH INSTITUTE-MAGNETISM AND MATTER -EXERCISE
  1. The magnetic moment of a short bar magnet is 2 Am ^(2). The magnetic f...

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  2. The work done in rotating a bar magnet f magnetic moment M from its un...

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  3. The potential enargy of bar magnet of magnetic moment 8 Am ^(2) placed...

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  4. Force between two identical bar magnets whose centres are r metre apar...

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  5. Gauss's law in magnelism ensures that

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  6. Which of the following is responsible for the earth's magnetic field ...

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  7. The angle between the magnetic meridian and geographical meridian is c...

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  8. Isogonic lines are the lines joining places of…………………….. .

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  9. At a place, if the earth's horizontal and vertical components of magne...

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  10. A dip circle is placed in magnetic meridian then the magnetic needle w...

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  11. A dip needle in a plane perpendicular to magnetic meridian will remain

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  12. The original value of the angle of dip at a place is 45^(@) what will...

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  13. A dip circle is placed in geographic meridian at a place where dip and...

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  14. The values of apparent angles of dip in two places measured in two mut...

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  15. A magnetic dipole of magnetic moment 1.44 A m^2 is placed horizontally...

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

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  17. The length of a magnet is large compared to its width and breadth. The...

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  18. A defiection magnetometer works on

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  19. The arms of a deflection magnetometer in tangent B position are placed...

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  20. The deflection magnetometer is most sensitive when the defiection the...

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