Home
Class 12
PHYSICS
If rotational velocity of a dynamo armat...

If rotational velocity of a dynamo armature is doubled, then induced e.m.f. will become

A

half

B

two times

C

four times

D

unchanged

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION

    TARGET PUBLICATION|Exercise EVALUATION TEST|8 Videos

  • ELECTROMAGNETIC INDUCTION

    TARGET PUBLICATION|Exercise CRITICAL THINKING|84 Videos

  • ELASTICITY

    TARGET PUBLICATION|Exercise Evaluation test|14 Videos

  • ELECTROSTATICS

    TARGET PUBLICATION|Exercise EVALUATION TEST|14 Videos

Similar Questions

Explore conceptually related problems

If the angular speed of the armature of a dynamo is doubled then the amplitude of the induced e.m.f will become_______.

The induced e.m.f in a circuit

The cause of induced e.m.f is

In a dc motor, induced e.m.f. will be maximum

The direction of the induced e.m.f. is determined by

A conductor is moving with the velocity v in the magnetic field and induced current is I. If the velocity of conductor becomes double, the induced current will be

TARGET PUBLICATION-ELECTROMAGNETIC INDUCTION-COMPETITIVE THINKING
  1. A coil having 'n' turns and resistance R Omgea is connected with a gal...

    Text Solution

    |

  2. A wire of length 50 cm moves with a velocity of 300 m/min, perpendicul...

    Text Solution

    |

  3. If rotational velocity of a dynamo armature is doubled, then induced e...

    Text Solution

    |

  4. A straight conductor 0.1 m long moves in a uniform magnetic field 0.1 ...

    Text Solution

    |

  5. A rod of 10 cm length is moving perpendicular to uniform magnetic fiel...

    Text Solution

    |

  6. A boat is moving due east in a region where the earth's magnetic field...

    Text Solution

    |

  7. Consider a metal ball of radius 'r' moving at a constant velocity 'v' ...

    Text Solution

    |

  8. An aircraft with a wingspan of 40 m flies a speed of 1080 km hr(1) in ...

    Text Solution

    |

  9. A circular wire of radius r rotates about its own axis with angular sp...

    Text Solution

    |

  10. A six pole generotar with fixed field excitation developes an e.m.f. o...

    Text Solution

    |

  11. A wheel with 10 spokes each of length 'L' m is rotated with a unifrom ...

    Text Solution

    |

  12. Eddy currents are produced in a matterial when it is

    Text Solution

    |

  13. The pointer of a dead-beat galvanometer gives a steady deflection beca...

    Text Solution

    |

  14. A coil is suspended in a uniform magnetic field, with the plane of the...

    Text Solution

    |

  15. Choke coil works on the principle of

    Text Solution

    |

  16. The unit of inductance is

    Text Solution

    |

  17. An e.m.f. of 5 "volt" is produced by a self-inductance, when the curre...

    Text Solution

    |

  18. A varying current in a coil change from 10A to 0A in 0.5 sec. If the a...

    Text Solution

    |

  19. In a coil, L=5H, current changes at the rate of 2 ampere per second. ...

    Text Solution

    |

  20. the inductance of a closed-packed coil of 400 turns is 8mH. A current ...

    Text Solution

    |