Home
Class 8
PHYSICS
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.
Promotional Banner

Topper's Solved these Questions

  • MAGNETISM

    PEARSON IIT JEE FOUNDATION|Exercise Fill in the blanks|7 Videos

  • MAGNETISM

    PEARSON IIT JEE FOUNDATION|Exercise Matching|1 Videos

  • MAGNETISM

    PEARSON IIT JEE FOUNDATION|Exercise Short answer type question|20 Videos

  • LIGHT

    PEARSON IIT JEE FOUNDATION|Exercise COMPETITION CORNER|59 Videos

  • MEASUREMENTS

    PEARSON IIT JEE FOUNDATION|Exercise Level 3|10 Videos
PEARSON IIT JEE FOUNDATION-MAGNETISM -Concept Application (level-1)
  1. The above diagrame is the pattern of magnetic lines of force obtained ...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  5. The effective length of the magnet shown above is .

    Text Solution

    |

  6. The equatorial meridian of a magnet

    Text Solution

    |

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

    Text Solution

    |

  8. When a magnet is broken into two parts,

    Text Solution

    |

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

    Text Solution

    |

  10. An electric bell works on the principle of

    Text Solution

    |

  11. Define angle of declination.

    Text Solution

    |

  12. Which of the follwing molecular species does not exist?

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |