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

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

A

5

B

10

C

20

D

1

Text Solution

Verified by Experts

The correct Answer is:
D

emf `= L(di)/(d t)`
L = 1 mH
Promotional Banner

Topper's Solved these Questions

  • SAMPLE PAPER - 8

    EDUCART PUBLICATION|Exercise Section C|6 Videos
  • SAMPLE PAPER - 8

    EDUCART PUBLICATION|Exercise Section C|6 Videos
  • CBSE TERM-1 SAMPLE PAPER 1

    EDUCART PUBLICATION|Exercise SECTION-C|6 Videos
  • SAMPLE PAPER 04 (SOLVED)

    EDUCART PUBLICATION|Exercise SECTION-C|6 Videos

Similar Questions

Explore conceptually related problems

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) When the current in a coil changes from 8A to 2A in 3xx10^(-2)s , the emf induced in the coil is 2V . The self-induced of coil in mH (b) A 12V battery conneted to a 6Omega . 10H coil through a switch drives a constant current in the circuit. The switch is suddenly opened. Assuming that it took 1msec to open the switch, calculate the average emf induced across the coil. (c) The equivalent inductance of two inductored in series. What is the value of inductances of the individual inductors? (d) If i=5A and decreasing at a rate of 10^(3) (A/sec), find V_(B)-B_(A) .

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 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 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

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

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 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

When the current in a coil charges from 2A to 4A in 0.05 s, emf of 8 volt is induced in the coil. The coefficient of self induction of the coil is -

When the current in a coil charges from 2A to 4A in 0.05 s, emf of 8 volt is induced in the coil. The coefficient of self induction of the coil is -

EDUCART PUBLICATION-SAMPLE PAPER - 8-Section B
  1. What is the power dissipated by a bulb of 100 W - 220 V connected to a...

    Text Solution

    |

  2. Total resistance of the circuit:

    Text Solution

    |

  3. Total current flowing through the circuit:

    Text Solution

    |

  4. If number of turns in a coil is quadrupled, then self-inductance will ...

    Text Solution

    |

  5. A 1m long calculating rod rotates with an angular frequency of 400 rad...

    Text Solution

    |

  6. The current in a coil changes from 0 to 2 A in 0.05 sec. If the induce...

    Text Solution

    |

  7. When the current in a coil changes from 8A to 2A in 3xx10^(-2)s , th e...

    Text Solution

    |

  8. Lenz's law is a consequence of law of conservation of

    Text Solution

    |

  9. A soap bubble is given a negative charge, then its radius

    Text Solution

    |

  10. Select the correct statement: (I) Two field lines can not cross each...

    Text Solution

    |

  11. The current through a solenoid when it replaces a bar magnet A = 2 xx ...

    Text Solution

    |

  12. A circular coil expands radially in a region of magnetic field and no ...

    Text Solution

    |

  13. Voltage across an inductor, capacitor and a resistor is 30 V, 0 V and ...

    Text Solution

    |

  14. At resonance, what will be the phase difference between voltage and a ...

    Text Solution

    |

  15. When L = 2 H, C = 32 mu F and R = 10Omega , then the resonant frequenc...

    Text Solution

    |

  16. Assertion : In a simple battery circuit the point of lowest potential ...

    Text Solution

    |

  17. Assertion (A): Resistances connected in parallel has higher equivalent...

    Text Solution

    |

  18. Assertion (A) : Conductivity is due to mobile charge carriers of the b...

    Text Solution

    |

  19. Assertion. When charges are shared between any two bodies, no charge i...

    Text Solution

    |

  20. Assertion: Increasing the charge on the plates of a capacitor means in...

    Text Solution

    |