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List three sources of magnetic fields....

List three sources of magnetic fields.

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Magnetic fields can be produced :
(i) by using a permanent magnet
(ii) by passing electric current through a straight wire or a circular coil (solenoid)
(iii) by using an electromagnet
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LAKHMIR SINGH & MANJIT KAUR-MAGNETIC EFFECT OF ELECTRIC CURRENT -Exercise
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  4. Which of the following correctly describes the magnetic field near a l...

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  5. The device used for producing electric current is called a:

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  6. The essential difference between an AC generator and a DC generator is...

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  7. At the time of short-circuit, the current in the circuit:

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  8. State whether the following statements are true or false. (a) An ele...

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  9. List three sources of magnetic fields.

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  10. How does a solenoid behave like a magnet? Can you determine the north ...

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  11. When is the force experienced by a current-carrying conductor placed i...

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  12. Imagine you are sitting in a chamber with your back to one wall. An el...

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  13. Draw a labelled diagram of an electric motor. Explain its principle an...

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  14. Name some devices in which electric motors are used.

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  15. A coil of insulated copper wire is connected to galvanometer. What wou...

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  16. Two circular coils A and B are placed close to each other. If the curr...

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  17. State the rule to determine the direction of a (i) magnetic field p...

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  18. Explain the underlying principle and working of an electric generator ...

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  19. When does an electric short-circuit occur?

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  20. What is the function of an earth wire? Why is it necessary to earth me...

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