Home
Class 12
PHYSICS
When the current in a coil changeg from ...

When the current in a coil changeg from `8` amperes to `2` amperes in `3xx10^(-2)` seconds, the e.m.f. induced in the coil is `2` volt. The self-inductance of the coil (in millihenry) is

A

10 mH

B

20 mH

C

5 mH

D

1 mH

Text Solution

Verified by Experts

The correct Answer is:
A
According to Faraday.s law of electro-magnetic inductions,
`e=|L(dI)/(dt)|rArr 2=L((8-2))/(3xx10^(-2))rArr L=10 mH`
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION

    DISHA PUBLICATION|Exercise EXERCISE - 2 : Concept Applicator|29 Videos

  • ELECTROMAGNETIC INDUCTION

    DISHA PUBLICATION|Exercise EXERCISE - 2 : Concept Applicator|29 Videos

  • ELECTRIC CHARGES AND FIELDS

    DISHA PUBLICATION|Exercise Exercise - 2 : Concept applicator|24 Videos

  • ELECTROMAGNETIC WAVES

    DISHA PUBLICATION|Exercise Exercise - 2 : Concept Applicator|30 Videos

Similar Questions

Explore conceptually related problems

When current in a coil changes to 2 ampere from 8 ampere in 3xx10^(-3) , the e.m.f. induced in the coil is 2 volt. The self-inductance of the coil in millihenry is

When the current in a coil changes from 8A to 2A in 3xx10^(-2)s , th eemf induced in the coil is 2V . The self-induced of coil in mH

A varying current ina coils chagre from 10 A to zero in 0.5 s .If the average emf induced in the coils is 220 V , the self- inductance of the coils is

If the current in the primary coil is reduced from 3.0 ampere to zero in 0.001 second, the induced e.m.f in the secondary coil is 1500 volt. The mutual inductance of the two coils will be-

The current in a coil changes from 4 ampere to zero in 0.1s . If the average e.m.f. induced is 100 volt , what is the self-inductance of the coil?

If the current in the primary coil is reduced from 3A to zero in 10 second, then the induced e.m.f. in the secondary is 15xx10^(-3) volt. The mutual inductance of the coil will be

When the current in a coil changes from 2A to 4A in 0.05 sec, the e.m.f. developed in the coil is 8V. The coefficent of self induction of the coil is

The current in a coil changes from 0 to 2 A in 0.05 sec. If the induced e.m.f is 80 V, the self inductance of the coil is

The current in a coil decreases from 5 A to 0 in 0.1 sec. If the average e.m.f induced in the coil is 50 V, then the self inductance of the coil is

A varying current in a coil change from 10A to 0A in 0.5 sec . If the average emf induced in the coil is 220V , the self inductance of the coil is

DISHA PUBLICATION-ELECTROMAGNETIC INDUCTION -EXERCISE - 1 : Concept Builder
  1. Two coils have a mutual inductance 0.005 H. The current changes in the...

    Text Solution

    |

  2. A varying current in a coils charge from 10 A to zero in 0.5 s .If th...

    Text Solution

    |

  3. When the current in a coil changeg from 8 amperes to 2 amperes in 3xx1...

    Text Solution

    |

  4. A coil of N=100 turns and area 1cm^2 carries a current I=5 A and creat...

    Text Solution

    |

  5. In an inductance coil the current increases from zero to 6 ampere in 0...

    Text Solution

    |

  6. The mutual inductance of a pair of a coil is 0.75 H. if the current in...

    Text Solution

    |

  7. The coefficient of self-inductance of a solenoid is 0.18 mH. If a crud...

    Text Solution

    |

  8. Two coil are placed close to each other. The mutual inductance of the ...

    Text Solution

    |

  9. A current of 2.5 A flows through a coil of inductance 5 H. The magneti...

    Text Solution

    |

  10. Two neighbouring coils A and B have a mutual inductance of 20 mH. The ...

    Text Solution

    |

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

    Text Solution

    |

  12. A coil is wound on a frame of rectangular cross - section. If all the ...

    Text Solution

    |

  13. Two coaxial solenoids are made by winding thin insulated wire over a p...

    Text Solution

    |

  14. A copper rod of length l is rotated about one end perpendicular to the...

    Text Solution

    |

  15. Aconductor of lengfht 0.4 m is moving with a speed of 7 m/s perpendic...

    Text Solution

    |

  16. A wire of length 1 m is moving at a speed of 2 ms^(-1) perpendicular t...

    Text Solution

    |

  17. Two identicaly induction coils each of inductance L joined in series ...

    Text Solution

    |

  18. A thin wire of length 2m is perpendicular to the xy plane. It is moved...

    Text Solution

    |

  19. A rectangular coil of single trun, having area A , rotates in a unifor...

    Text Solution

    |

  20. The two rails of a railway track, insulated from each other and the gr...

    Text Solution

    |