Home
Class 12
PHYSICS
In an A.C. generator, a coil with N turn...

In an A.C. generator, a coil with N turns, all the same area A and total resistance R, rotate with frequency `omega` in a magnetic field B. The maximum value of emf generated in the coil is …..

A

NABR

B

`omegaNAB`

C

`omegaNABR`

D

NAB

Text Solution

Verified by Experts

The correct Answer is:
B
Induced emf , `epsilon=NABomega sin omegat`
If sin `omegat=1` then `epsilon=epsilon_"max"`
`therefore epsilon_"max" =NABomega`
Promotional Banner

Topper's Solved these Questions

  • ALTERNATING CURRENTS

    KUMAR PRAKASHAN|Exercise SECTION-D MCQs (DARPAN BASED ON TEXTBOOK)|188 Videos

  • ATOMS

    KUMAR PRAKASHAN|Exercise Section-D -MCQs asked in GUJCET / Board Exam|34 Videos

Similar Questions

Explore conceptually related problems

A coil of area A is placed in the X-Y plane. A uniform magnetic field B_0hati established. The emf induced in the coil is ____

An inductance L and a resistance R are connected in series with a battery of emf e. Find the maximum rate at which the energy is stored in the magnetic field.

When a bar magnet is brought closer to a coil, emf generated in the coil does not depend on ______

A : Torque on the coil is the maximum, when coil is suspended in a radial magnetic field. R : The torque tends to rotate the coil on its own axis.

The flux linked per each turn of a coil of N turns changes from phi_1 to phi_2 . If the total resistance of the circuit including the coil is R. The induced charge in the coil is _____

A 100 turn closely wound circular coil of radius 10 cm carries a current of 3.2 A. (a) What is the field at the centre of the coil? (b) What is the magnetic moment of this coil? The coil is placed in a vertical plane and is free to rotate about a horizontal axis which coincides with its diameter. A uniform magnetic field of 2T in the horizontal direction exists such that initially the axis of the coil is in the direction of the field. The coil rotates through an angle of 90^@ under the influence of the magnetic field. (c) What are the magnitudes of the torques on the coil in the initial and final position? (d) What is the angular speed acquired by the coil when it has rotated by 90^@ ? The moment of inertia of the coil is 0.1 kg m^2 .

An inductor of inductance L and resistance R is connected of A.C. circuit having angular frequency of omega . The value of quality factor Q is ……

Two coils have a mutual inductance of 0.005H. The current changes in the first coil according to equation I=I_0 sin omegat , where I_0 = 10A and omega = 100pi rad/sec. The maximum value of emf in the second coil is ___

A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the coil?

A circular coil of wire consisting of 100 turns, each of radius 4.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the coil ?

KUMAR PRAKASHAN-ALTERNATING CURRENTS -SECTION-D MCQs (COMPETITIVE EXAMS)
  1. The phase difference between the alternating current and emf is pi/2 r...

    Text Solution

    |

  2. In L-C-R series circuit at resonance p.d. between two ends of resistor...

    Text Solution

    |

  3. In an A.C. generator, a coil with N turns, all the same area A and tot...

    Text Solution

    |

  4. In A.C. circuit, when E = E0 sin omegat supply applied, current is obt...

    Text Solution

    |

  5. An inductor (L = 0.03 H) and a resistor (R = 0.15 kOmega) are connecte...

    Text Solution

    |

  6. An LCR circuit is equivalent to a damped pendulum. In an LCR circuit t...

    Text Solution

    |

  7. An arc lamp requires a direct current of 10 A at 80 V to function. If ...

    Text Solution

    |

  8. For an RLC circuit driven with voltage of amplitude vm and frequency ...

    Text Solution

    |

  9. An emf of 20 V is applied at time t = 0 to a circuit containing in ser...

    Text Solution

    |

  10. An inductor of inductance L and resistance R is connected of A.C. circ...

    Text Solution

    |

  11. In an A.C circuit the current...

    Text Solution

    |

  12. A primary of transformer has 100 turns an secondary has 500 turns. If ...

    Text Solution

    |

  13. If in an A.C. circuit voltage V and current is then the power dissipat...

    Text Solution

    |

  14. In a step-down transformer ....... increases.

    Text Solution

    |

  15. The phase difference between current and voltage for L-C-R A.C. series...

    Text Solution

    |

  16. The value of capacitive reactance of capacitor XC. If the values of ca...

    Text Solution

    |

  17. When a wire loop is rotated in a magnetic field the direction of induc...

    Text Solution

    |

  18. In L-C-R circuit, the energy dissipated in …….

    Text Solution

    |

  19. The voltage of an A.C. source varies with time according to the equati...

    Text Solution

    |

  20. A L-C-R circuit connected to an A.C. source of frequency f. If current...

    Text Solution

    |