Home
Class 12
PHYSICS
A variable capacitor and an inductive co...

A variable capacitor and an inductive coil with negligible resistance are connected in series to an A.C. voltage of value `100V`. The current in the circuit is `5A`. When the capacitor decreases to half its value, the current becomes `10A`. The voltage across the capacitor, in first case, is

A

`40V`

B

`50V`

C

`60V`

D

`150V`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION

    TARGET PUBLICATION|Exercise COMPETITIVE THINKING|158 Videos

  • ELECTROMAGNETIC INDUCTION

    TARGET PUBLICATION|Exercise EVALUATION TEST|8 Videos

  • ELECTROMAGNETIC INDUCTION

    TARGET PUBLICATION|Exercise EVALUATION TEST|8 Videos

  • ELASTICITY

    TARGET PUBLICATION|Exercise Evaluation test|14 Videos

  • ELECTROSTATICS

    TARGET PUBLICATION|Exercise EVALUATION TEST|14 Videos

Similar Questions

Explore conceptually related problems

A coil of inductance 5.0 mH and negligible resistance is connected to an alternating voltage V=10 sin (100t) . The peak current in the circuit will be:

A capacitor of capacitance C is given charge Q and then connected in parallel to a coil of inductance L. There is no resitance in the circuit. When the charge on the capacitor becomes zero, the current in the coil will be

A capacitor of unknown capacitance, a coil of inductance L , and a resistor of re- sistance R are connected to a source of a.c. voltage E=e_(0) cos omegat (Fig. 112). The current in the circuit is I = (E_(0)//R) cos omegat . Determine the amplitude U0 of the voltage across the capacitor plates.

A capacitor, a resistor and a 40 mH inductor are connected in series to an a.c. source of frequency 60 Hz. Calculate the capacitance of the capacitor,if current is in phase with the voltage.

Resistor of resistance R and capacitor of capacitance C are connected in series to an AC source of angular frequency omega . Rms current in the circuit is I. When frequency of the source is changed to one - third of initial value keeping the voltage same then current is found to be halved. Find the ratio of reactance of capacitor to that with resistance at the original frequency omega .

An inductance of 0.5 H, a capacitor of capacitance 10^(-9)F and a resistane of 100Omega are connected in series across AC source of emf 10 V. the current through the circuit at resonance is

A resistor R and the capacitor C are connected in series across an ac source of rms voltage 5V if the rms voltage across C is 3V then that across R is .

A diode is connected to 220V (rms) ac in series with a capacitor as shown in fig. The voltage across the capacitor is

TARGET PUBLICATION-ELECTROMAGNETIC INDUCTION-CRITICAL THINKING
  1. When 100 V DC is applied across a solenoid, a current of 1.0 A flows i...

    Text Solution

    |

  2. It is found that the current in the circuit is 0.50A with D.C. source ...

    Text Solution

    |

  3. A variable capacitor and an inductive coil with negligible resistance ...

    Text Solution

    |

  4. The e.m.f. and the current of an A.C. circuit are e=5cos omega t volt ...

    Text Solution

    |

  5. Average power lost per cycle of A.C. is given by

    Text Solution

    |

  6. In an A.C. circuit, the current flowing in inductance is I = 5 sin (10...

    Text Solution

    |

  7. When a coil is connected to a D.C. source of e.m.f. 12 volt, then a cu...

    Text Solution

    |

  8. The equations of voltage and current in an A.C. circuit are e=100 sin ...

    Text Solution

    |

  9. The r.m.s current in an AC circuit is 2A. If the wattless current be s...

    Text Solution

    |

  10. If power factor is 1//2 in a series RL, circuit R=100 Omega. AC mains ...

    Text Solution

    |

  11. 2.5/(pi) muF capacitor and 3000-ohm resistance are joined in series t...

    Text Solution

    |

  12. A resistor R, an inductor L and a capacitor C are connected in series ...

    Text Solution

    |

  13. A coil of 4mH and a capacitor of 10 muF are in series with an A.C. sou...

    Text Solution

    |

  14. The frequency at which the inductive reactance of 2 H inductance will ...

    Text Solution

    |

  15. An A.C. voltage of r.m.s. value 0.1V is applied to an LCR series circu...

    Text Solution

    |

  16. The frequency at which 9.0mh inductor and 10 mu F capacitor will have ...

    Text Solution

    |

  17. A group of electric lamps having a total power rating of 1000 watt is ...

    Text Solution

    |

  18. A coil has a inductance of 0.7H and is joined in series with a resista...

    Text Solution

    |

  19. What is the r.m.s. value of an alternating current which when passed t...

    Text Solution

    |

  20. A horizontal straight conductor when placed along south-north directio...

    Text Solution

    |