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A magnetised wire of magnetic moment 'M'...

A magnetised wire of magnetic moment `'M'` and length `'l'` is bent in the form of a semicircle of radius `'r'`. The new magnetic moment is

A

`M/pi`

B

`(2Mr)/l`

C

`M/(2pi)`

D

`M/(4pi)`

Text Solution

Verified by Experts

The correct Answer is:
B
For semi circle, `M^(1)=(2M)/pi" here "l=pir`
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NARAYNA-MAGNETISM AND MATTER-EXERCISE - 1 (H.W)
  1. If a bar magnet of pole strength 'm' and magnetic moment 'M' is cut eq...

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  2. If two identical bar mangets, each of length 'I', pole strength 'm' a...

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  3. A magnetised wire of magnetic moment 'M' and length 'l' is bent in the...

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

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  5. A magnet of magnetic 'M' is in the form of a quadrant of a circle. If ...

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  6. A bar magnet of moment 'M' is bent into a shape . If the length of the...

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  7. Four magnets of magnetic moments M,2M,3M and 4M are arranged in the fo...

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  8. Three identical bar magnets each of magnetic moment M are arranged in ...

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  9. A torque of 2X10^(-4)Nm is required to hold a magnet at right angle to...

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  10. A bar magnet of 5 cm long having a pole strenght of 20 A.m. Is deflect...

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  11. A short bar magnet placed with its axis at 30^(@) with a uniform exter...

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

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

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

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

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

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

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

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

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

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