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Calculating the magnetic moment ( in Am^...

Calculating the magnetic moment ( in `Am^2`) of a thin wire with a current I=8A, wound tightlly on a half a tore (see figure). The diameter of the cross section of the tore is equal to d=5cm, and the number of turns is N=500.

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The correct Answer is:
`[(1)/(2)Id^(2)N]`
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PHYSICS GALAXY - ASHISH ARORA-MAGNETIC EFFECTS OF CURRENT AND MAGNETISM-Practice Exercise
  1. A positively charged particle having charge q1 = 1 C and mass m1 =40 g...

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  3. In the Bohr model of the hydrogen atom, the electron circuulates aroun...

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  4. A rectangular loop consists of N = 100 closed wrapped turns and has di...

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  5. A coil in the shape of an equilateral triangle of side 0.02 m is suspe...

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  6. A wire loop carrying I is placed in the x-yplane as shown in fig. (...

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  7. A coil of radius R carries current i1. Another concentric coil of radi...

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  8. A small coil C with N = 200 turns is mounted on one end of a balanc...

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  9. A uniform constant magnetic field B is directed at an angle of 45^(@) ...

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  10. Calculating the magnetic moment ( in Am^2) of a thin wire with a curre...

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  11. A flat circular coil with 10 turns of wire on it has a diameter 20mm a...

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  12. A coil al a moving Coil galvanometer twists through 90^@ when a curren...

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  13. A short bar magnet is placed in magnetic meridian with its north pole ...

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  14. A magnetic dipole of magnetic moment 6Am^(2) is lying in a horizontal ...

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  15. A coil of 50 turns and 10cm diameter is made out of a wire of resistiv...

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  16. Two circular coils C1 and C2 each of 100 turns are held in such a way ...

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  17. A magnetic needle suspended in a vertical plane at 30^@ from the magne...

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  18. Two small magnets of magnetic moments 0.108Am^(2) and 0.192 Am^(2) are...

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  19. A short magnet porduces a deflection of 30^(@) when placed at certain ...

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  20. A magnetic needle performs 20 oscillations per minute in a horizontal ...

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