Home
Class 12
PHYSICS
In an LR circuit, current at t=0 is 2A ....

In an LR circuit, current at t=0 is 2A . After 2s it reduced to 18A. The time constant of the circuit is (in second)

A

`In((10)/(9))`

B

2

C

`(2)/(In((10)/(9)))`

D

`2In((10)/(9))`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • ALTERNATING CURRENT

    DC PANDEY|Exercise Level 2 Subjective|10 Videos

  • ATOMS

    DC PANDEY|Exercise MEDICAL ENTRANCES GALLERY|42 Videos

Similar Questions

Explore conceptually related problems

In an LR circuit, current at t = 0 is 20 A . After 2 s it reduces to 18 A . The time constant of the circuit is :

Time constant of LR circuit will be

A coil carrying a steady current is short-circuited. The current in it decreases alpha times in time t_(0) . The time constant of the circuit is

The current in a LR circuit builds up to 3/4 th of its steady state value in 4s. The time constant of this circuit is

In an LR-circuit the current attains one-third of its final steady value in 5s. What is the time-constant of the circuit ? (log_(2) = 0.405)

The current in a LR circuit builds up to (3)/(4)th of its steady state value in 4s . The time constant of this circuit is

The current in a LR circuit builds up to (3)/(40th of its steady state value ion 4s . The time constant. Of this circuit is

The current in a discharging LR circuit without the battery drops from 2.0 A to 0.10 s. (a) find the time constant of the circuit. (b) if the inductance of the circuit is 4.0 H, what is its resistance?

The current in a discharging LR circuit is given by I = i_0 e^(-t/tau) where tau is the time constant of the circuit. Calculate the rms current for the period t = 0 to t = tau .

Current in an LR circuit attains one-fourth of its steady state value in 2 seconds. Calculate time constant for this circuit.

DC PANDEY-ALTERNATING CURRENT-JEE MAIN
  1. Dimensions of underset("electric flux")overset("magnetic flux") to are

    Text Solution

    |

  2. A current of 2A is increasing at a rate of 4A//s through a coil of ind...

    Text Solution

    |

  3. In an LR circuit, current at t=0 is 2A . After 2s it reduced to 18A. T...

    Text Solution

    |

  4. A coil of inductance 1H and neligible resistance is connected to a sou...

    Text Solution

    |

  5. The ratio of time constant during current growth and current decay of...

    Text Solution

    |

  6. In an L-R circuit connected to a battery of constant emf E, switched i...

    Text Solution

    |

  7. Some magnetic flux is changed from a coil resistance 10Omega. As a res...

    Text Solution

    |

  8. Two circular coils A and B are facing each other in shown figure. The ...

    Text Solution

    |

  9. Two coils are at fixed location: When coil 1 has no corrent and the cu...

    Text Solution

    |

  10. Two identical coaxial circular loops carry a current i each circulatin...

    Text Solution

    |

  11. Two coil A and B have coefficient of mutual inductance M=2H. The magne...

    Text Solution

    |

  12. A square coil ABCD lying in x-y plane with its centre at origin. A lon...

    Text Solution

    |

  13. A conducting rod AB of length l=1m is moving at a velocity vA=4m//s ma...

    Text Solution

    |

  14. A cylindrical space of radius R is filled with a uniform magnetic indu...

    Text Solution

    |

  15. A semicircle conducting ring of radius R is placed in the xy plane, as...

    Text Solution

    |

  16. A rod of length 10 cm made up of conducting and non-conducting materia...

    Text Solution

    |

  17. Power factor in series LCR circuit at reasonance is

    Text Solution

    |

  18. In the circuit shown in figure value of V(R) is

    Text Solution

    |

  19. In the circuit shown in figure current in the circuit is

    Text Solution

    |

  20. The power factor of the circuit shown in the figure is

    Text Solution

    |