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What happens to the length of a ferromag...

What happens to the length of a ferromagnetic rod when it is magnetised?

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The length slightly increases because of the alignment of the domains in the direction of the external field.
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AAKASH SERIES-MAGNETISM-EXERCISE (VERY SHORT ANSWER QUESTIONS)
  1. When is the couple acting on a bar magnet in a uniform magnetic field ...

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  2. Define the magnetic moment of a bar magnet. What is its direction?

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  3. What are the units of the following physical quantities? i) magneti...

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  4. A bar magnet of magnetic moment M is bent into a semicircle. What is i...

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  5. A bar magnetic dipole moment M is cut into two equal pieces as shown, ...

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  6. The magnetic moment of a bar magnet is M. If it is cut into two pieces...

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  7. Define magnetic flux density ( magnetic induction ) . The magnetic ind...

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  8. Derive an expression for the magnetic induction at a point on the axia...

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  9. Derive an expression for the magnetic induction at a point on the axia...

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  10. A magnet is placed horizontally on ground with its north pole towards ...

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  11. When the Npole of a bar magnet points towards uniform the South and Sp...

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  12. What is the magnetic induction at the mid-point of the straight line j...

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  13. Two magnets of magnetic moments M1 and M2 are joined at their centres ...

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  14. On what factors does the period of oscillation of a bar magnet in a un...

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  15. How do you determine the magnetic nature of a material, given in the f...

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  16. Classify the following substances into Dia, Para and Ferro magnetic ma...

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  17. The relative permeability of silicon is 0.999837 and that of palladium...

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  18. What happens to the length of a ferromagnetic rod when it is magnetise...

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  19. What happens to the magnetism of an iron bar magnet when it is melted?

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  20. A red hot steel needle is suspended along the North South direction an...

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