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A bar magnet of 5 cm long having a pole ...

A bar magnet of `5 cm` long having a pole strenght of `20 A.m`. Is deflected through `30^(@)` from the magnetic meridian. If `H=(320)/(4pi)A//m`, the deflecting couple is

A

`1.6xx10^(-4)`Nm

B

`3.2xx10^(-5)Nm`

C

`1.6xx10^(-5)`Nm

D

`1.6xx10^(-2)`Nm

Text Solution

Verified by Experts

The correct Answer is:
C
`C=Mmu_(0)Hsintheta`
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NARAYNA-MAGNETISM AND MATTER-EXERCISE - 1 (H.W)
  1. Three identical bar magnets each of magnetic moment M are arranged in ...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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