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In Which of the following devices is a p...

In Which of the following devices is a permanent magnet not used ?

A

Electric motor

B

Telegraph

C

Generators

D

Particle accelerators

Text Solution

Verified by Experts

The correct Answer is:
B
Permanent magnets are used in electric motor, generator and particle accelerator. An electromagnet, which is a temporary magnet, is used in telegraph system.
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PEARSON IIT JEE FOUNDATION-MAGNETISM -CONCEPT APPLICATION (Level 1)
  1. The above diagrame is the pattern of magnetic lines of force obtained ...

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  2. In the single touch method of magnetization , the north pole of a bar ...

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  3. Assertion: Magnetic lines of force never intersect. Reason: The dire...

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  4. The vertical plane in which magnetic needle lies at a place is called

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  5. The effective length of the magnet shown above is

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  6. The equatorial meridian of a magnet

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  7. A bar magnet is moved over a steel bar as shown in the figure. Choos...

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  8. When a magnet is broken into two parts,

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  9. In the electrical method of magnetization, the polarity of the end in ...

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  10. An electric bell works on the principle of

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  11. The angle of declination is

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  12. Ewing's molecular theory does not explain

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  13. Which of the following substance is repelled by strong magnet ?

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  14. In Which of the following devices is a permanent magnet not used ?

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  15. A substance placed near a strong magnet is attracted by it, substance ...

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  16. In an unmagnetised iron bar, the molecules form .

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  17. Arrange the following statement in sequential order the process of plo...

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  18. A bar magnet has a pole strength of 15 Am. If the distance from its ce...

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  19. Arrange the following statement is sequential order to magnetize a ste...

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  20. The magnetic moment of a bar magnet 'A' and its length are twice that ...

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