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Why is pure iron not used for making per...

Why is pure iron not used for making permanent magnets? Name any one material used for making permanent magnets. Describe how permanent magnets are made electrically. State any two examples of electrical instruments made by using permanent magnets.

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MODERN PUBLICATION-MAGNETIC EFFECTS OF ELECTRIC CURRENT-EXERCISE
  1. Draw the patern of field lines due to a bar magnet. Mention any two pr...

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  2. State two properties of magnetic field lines.

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  3. Why is pure iron not used for making permanent magnets? Name any one m...

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  4. Draw the lines of force of the magnetic field through and around singl...

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  5. Draw the lines of force of the magnetic field through and around a sol...

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  6. State Fleming's left hand rule. With the help of a labelled diagram de...

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  7. What is an electromagnet? What does it consist of?

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  8. The best material to make permanent magnet is

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  9. Name one metal each to make a permanent magnet and a temporary magnet.

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  10. Describe an activity to show that you can make an electromagnet in you...

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  11. What is meant by magnetic field? Mention two parameters that are neces...

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  12. What are magnetic field lines? How is the direction of a magnetic fiel...

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  13. Describe an activity to demonstrate the direction of the magnetic fiel...

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  14. Using Biot-Savart's law, derive an expression for magnetic field at th...

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  15. What is an electromagnet?

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  16. What is an electromagnet ? List any of its two uses?

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  17. Draw a labelled diagram to show how an electromagnet is made.

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  18. What is the purpose of the soft iron core used in making an electroma...

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  19. What are magnetic field lines? How is the direction of a magnetic fiel...

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  20. Draw the lines of force of the magnetic field through and around singl...

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