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Why is soft-iron not used for making a p...

Why is soft-iron not used for making a permanent magnet?

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Soft iron loses its magnetism easily.
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Draw an appropriate schematic diagram showing common domestic circuits and discuss the importance of fuse. Why is it that a burnt out fuse should be replaced by another fuse of identical ratting? or Why is pure iron not used for making permanent magnets? Name one material used for making permanent magnets. Describe how permanent magnets are made electrically. State two examples of electrical instruments made by using permanent magnets.

The alloy used for making permanent magnet is

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PRADEEP-MAGNETIC EFFECTS OF ELECTRIC CURRENT-Additional Questions A. (very short)
  1. What type of core is used to make an electromagnet?

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  2. What are permanent magnets made of?

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  3. Why is soft-iron not used for making a permanent magnet?

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  4. Name the rule to find the direction of force on a current-carrying con...

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  5. What is the relation between a tesla, an ampere and a meter.

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  6. What is the force acting on charge (q) moving in a direction perpendic...

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  7. Which rule do we use to find the direction of this force?

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  8. How are magnetic field lines related to the strength of a magnetic fie...

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  9. What is the relation between magnetic field (B), current (I) and dista...

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  10. What is the magnitude of force acting on a current-carrying conductor ...

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  11. What important observation did Oersted make in his experiment with cur...

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  12. Why is magnetic field maximum at the centre of a current-carrying coil...

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  13. What is electromagnetic induction?

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  14. What do you mean by magnetic flux?

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  15. Name the rule which gives the direction of induced current?

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  16. Name the device which converts mechanical energy into electrical energ...

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  17. What type of dynamo is used in a bicycle?

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  18. What type of dynamo is used in industry?

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  19. What type of current is given by a cell?

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  20. What type of current is used in household supply?

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