Home
Class 12
PHYSICS
If the angular speed of the armature of ...

If the angular speed of the armature of a dynamo is doubled then the amplitude of the 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 & ALTERNATIVE CURRENT

    VMC MODULES ENGLISH|Exercise EFFICIENT|49 Videos

  • ELECTROMAGNETIC INDUCTION & ALTERNATIVE CURRENT

    VMC MODULES ENGLISH|Exercise IMPECCABLE|52 Videos

  • ELECTROMAGNETIC INDUCTION & ALTERNATIVE CURRENT

    VMC MODULES ENGLISH|Exercise IMPECCABLE|52 Videos

  • ELECTROMAGNETIC INDUCTION & ALTERNATING CURRENT

    VMC MODULES ENGLISH|Exercise IN-CHAPTER EXERCISE-G|10 Videos

  • ELECTROSTATICS

    VMC MODULES ENGLISH|Exercise JEE Advanced (Archive)|89 Videos

Similar Questions

Explore conceptually related problems

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

When DC motor run at full speed , then induced emf will be

Name two factors on which the magnitude of an induced e.m.f. in the secondary coil depends.

A spring mass system preforms S.H.M if the mass is doubled keeping amplitude same, then the total energy of S.H.M will become :

The average speed of gas molecules is v at pressure P, If by keeping temperature constant the pressure of gas is doubled, then average speed will become

A square frame ABCD of side a and a long current carrying conductor PQ are arranged as shown in the figure. If the frame moves towards right with a velocity v, the resultant induced e.m.f in the loop will be

The mutual inductance between two coils is 1.25 henry. If the current in the primary changes at the rate of 80 ampere//second , then the induced e.m.f. in the secondary is

Two identical loops , one of copper and the other of aluminium , are rotated with the same angular speed in the magnetic field . Compare (i) the induced emf and (ii) the current produced in the two coils . Justify your answer .

A rectangular coil of 300 turns has an average area of average area of 25 cmxx10 cm the cooil rotates with a speed of 50 cps in a uniform magnetic field of strength 4xx10^(-2)T about an axis perpendicular of the field. The peak value of the induced e.m.f. is (in volt)

A flat coil of 500 turns each of area 50 cm^(2) rotates in a uniform magnetic field of 0.14 Wb//m^(2) at an angular speed of 150 rad//sec . The coil has a resistance of 5 Omega . The induced e.m.f. is applied to an external resistance of 10 ohm. Calculate the peak current through the resistance.

VMC MODULES ENGLISH-ELECTROMAGNETIC INDUCTION & ALTERNATIVE CURRENT -ENABLE
  1. The core of a transformer is laminated to reduce

    Text Solution

    |

  2. Eddy current are produce when

    Text Solution

    |

  3. If the angular speed of the armature of a dynamo is doubled then the a...

    Text Solution

    |

  4. Choke coil works on the principle of

    Text Solution

    |

  5. When speed of a DC generator decreases, the armature current

    Text Solution

    |

  6. Which of the following statement is incorrect :

    Text Solution

    |

  7. An alternating voltage E = 200sqrt 2sin(100t) is connected to a muF ca...

    Text Solution

    |

  8. An AC circuit consists of an inductor of inductance 0.5H and a capacit...

    Text Solution

    |

  9. The average power dissipated in a pure capacitance AC circuit is

    Text Solution

    |

  10. In a region of unform magnetic induction B=10^(-2) T, a circulr coil ...

    Text Solution

    |

  11. An inductive circuit a resistance of 10ohm and an inductance of 2.0 h...

    Text Solution

    |

  12. In a LCR circuit having L=8.0 henry, C=0.5 mu F and R=100 ohm in serie...

    Text Solution

    |

  13. In a series resonant L-C-R circuit, the capacitance is changed from C ...

    Text Solution

    |

  14. A 120 volt AC source is connected across a pure inductor of inductance...

    Text Solution

    |

  15. A generator produces a time varying voltage given by V=240 sin 120 t, ...

    Text Solution

    |

  16. A sinusoidal ac current flows through a resistor of resistance R . If ...

    Text Solution

    |

  17. A 40Omega electric heater is connected to a 200 V , 50 Hz mains supply...

    Text Solution

    |

  18. The rms value of an AC of 50Hz is 10 A. the time taken by an alternati...

    Text Solution

    |

  19. The root mean square value of the alternating current is equal to

    Text Solution

    |

  20. The potential differences V and the current i flowing through an instr...

    Text Solution

    |