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A long thin magnet of moment M is bent i...

A long thin magnet of moment `M` is bent into a semi circle. The decrease in the magnetic moment is

A

`4 pi A-m^(2) `

B

`8 pi A-m^(2)`

C

`4A-m^(2) `

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
D
The magnetic moment will be zero because it becomes an open circuit .
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-MAGNETISM-I-Exercise 1
  1. SI unit of magnetic pole strength is

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  2. A bar magnet of magnetic moment M(1) is axially cut into two equal par...

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  3. A long thin magnet of moment M is bent into a semi circle. The decreas...

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  4. Following figures show the arrangement of bar magnets in different con...

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  5. At a point on the right bisector of a magnetic dipole the magnetic pot...

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  6. The magnetic field at a distance d from a short bar magnet in longitud...

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  7. Due to a small magnet intensity at a distance x in the end on position...

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  8. Two solenoids acting as short bar magnets P and Q are arranged such th...

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  9. A bar magnet of magnetic moment vec(M) is placed in a magnetic field o...

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  10. The couple acting on a magnet of length 10cm and pole strength 15A-m, ...

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  11. A bar magnet is held at right angle to a uniform magneitc field. The c...

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  12. The effect due to uniform magnetic field on a freely suspended magneti...

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  13. With reference to magnetic dipole , match the terms of Column I with t...

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  14. A short bar magnet pleaced with its axis at 30^(@) with a uniform exte...

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  15. The earth's magnetic field is approximately

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  16. Magnetic meridian is an imaginary:

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

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  18. Lines which represent places of constant angle of dip are called

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  19. Aclinic lines are the lines joining places of

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  20. The angle which are total magnetic field of earth makes with the surfa...

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