Home
Class 12
PHYSICS
A circular coil of mean radius of 7 cm a...

A circular coil of mean radius of `7 cm` and having `4000` turns Is rotate at the rate of `1800` revolution per minute in the earth 's magnetic field (B=0.5 gauss), the maximum e.m.f. induced in coil will be

A

`1.158 V`

B

`0.57 V`

C

`0.29 V`

D

`5.8 V`

Text Solution

Verified by Experts

The correct Answer is:
B
Induced emf, `e_(0)=omegaNBS=(2piv)NB(pir^(2))=2xxpi^(2)vNBr^(2)`
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION

    DC PANDEY|Exercise Taking it together|119 Videos

  • ELECTROMAGNETIC INDUCTION

    DC PANDEY|Exercise Medical entrance special format questions|17 Videos

  • ELECTROMAGNETIC INDUCTION

    DC PANDEY|Exercise Level 2 Subjective|20 Videos

  • CURRENT ELECTRICITY

    DC PANDEY|Exercise Medical entrances gallery|97 Videos

  • ELECTROMAGNETIC WAVES

    DC PANDEY|Exercise Sec C|22 Videos

Similar Questions

Explore conceptually related problems

A coil of area 80 square cm and 50 turns is rotating with 2000 revolution per minut about an axis perpendicular to a magnetic field field of 0.05 Telsa. The maximum value of the e.m.f. developed in it is

A coil of N turns and area A is rotated at the rate of n rotations per second in a magnetic field of intensity B, the magnitude of the maximum magnetic flux will be __

A circular coil of radius 10 cm having 100 turns carries a current of 3.2 A. The magnetic field at the center of the coil is

(a) Explain the meaning of the term mutual inductance. Consider two concentric circular coils, one radius r_(1) and the other of radius r_(2)(r_(1) lt r_(2)) placed coaxially with centres coinciding with each other. Obtain the expression for the mutual inductance of the arrangement. (b) A rectangular coil of area A , having number of turns N is rotated at 'f' revoluation per second in a uniform magnetic field B , the field being perpendicular to the coil. Prove that maximum emf induced in the coil is 2pifNBA .

A rectangular coil has 60 turns and its length and width is 20 cm and 10 cm recpectively . The coil rotates at a speed of 1800 rotation per minute in a uniform magnetic field of 0.5 T about its one of the diameter. The maximum induced emf will be :-

A circular coil of one turn of radius 5.0cm is rotated about a diameter with a constant angular speed of 80 revolutions per minute. A uniform magnetic field B=0.0IT exists in a direction perpendicular to the axis of rotation, the maximum emf induced, the average emf induced in the coil over a long period and the average of the squares of emf induced over a long period is

DC PANDEY-ELECTROMAGNETIC INDUCTION-Check point
  1. A conducing circular loop is placed in a uniform magnetic field of ind...

    Text Solution

    |

  2. The current flowing in two coaxial coils in the same direction. On inc...

    Text Solution

    |

  3. A circular coil of mean radius of 7 cm and having 4000 turns Is rotate...

    Text Solution

    |

  4. A coil of N turns and mean cross-sectional area A is rotating with uni...

    Text Solution

    |

  5. A 0.1 m long conductor carrying a current of 50 A is perpendicular to ...

    Text Solution

    |

  6. A metal rod of length 2 m is rotating with an angualr velocity of 100"...

    Text Solution

    |

  7. A conducting rod of length l is moving in a transverse magnetic field ...

    Text Solution

    |

  8. A rectangular coil rotates about an axis normal to the magnetic field,...

    Text Solution

    |

  9. A metallic square loop ABCD is moving in its own plane with velocity v...

    Text Solution

    |

  10. Consider the following statements: (a)An emf can be induced by moving ...

    Text Solution

    |

  11. The SI unit of inductance, the henry can be written as :

    Text Solution

    |

  12. A long solenoid has 500 turns. When a current of 2A is passed through ...

    Text Solution

    |

  13. If a current of 10 A changes in one second throught a coil, and the in...

    Text Solution

    |

  14. When the current in a coil charges from 2A to 4A in 0.05 s, emf of 8 v...

    Text Solution

    |

  15. The current passing through a choke coil of 5 hery is decreasing at th...

    Text Solution

    |

  16. In a coil of self-inuctance 0.5 henry, the current varies at a constan...

    Text Solution

    |

  17. The self inductance of a long solenoid cannot be increased by

    Text Solution

    |

  18. Self-inductance of a coil is 50mH. A current of 1 A passing through th...

    Text Solution

    |

  19. The self inductance of a coil is L . Keeping the length and area same,...

    Text Solution

    |

  20. In circular coil, when no. of turns is doubled and resistance becomes ...

    Text Solution

    |