Home
Class 12
PHYSICS
A ring is made of a nearly superconducti...

A ring is made of a nearly superconducting mate- rial. Inductance of the ring is `L = 0.5 H`. A current allowed to decay in the ring was observed to remain constant for a month. The instrument used to measure current could detect any change if it is greater than `1%`. Estimate the resistance of the ring considering it as a L R circuit with decaying current.

Text Solution

Verified by Experts

The correct Answer is:
`1.9 xx 10^(-9) Omega`
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION

    ARIHANT|Exercise Level 3|12 Videos

  • ELECTROMAGNETIC INDUCTION

    ARIHANT|Exercise Level 3|12 Videos

  • CURRENT ELECTRICITY

    ARIHANT|Exercise Current Electricity|105 Videos

  • ELECTROSTATICS

    ARIHANT|Exercise Level 3|59 Videos
ARIHANT-ELECTROMAGNETIC INDUCTION-Level 2
  1. A cylindrical region of radius R is filled with a uniform magnetic fie...

    Text Solution

    |

  2. cylindrical volume of radius R has a uniform axial magnetic field B, w...

    Text Solution

    |

  3. A uniform magnetic field B exists in a circular region of radius R. th...

    Text Solution

    |

  4. A thin beam of n identical positively charged particle are constrained...

    Text Solution

    |

  5. There is a long cylinder of radius R having a cylindrical cavity of ra...

    Text Solution

    |

  6. A uniform magnetic field B exists in a region of circular cross sectio...

    Text Solution

    |

  7. A conducting ring of mass m = pi kg and radius R = (1)/(2)m is kept on...

    Text Solution

    |

  8. A tightly wound solenoid of length l and cross sectional area A(1) is ...

    Text Solution

    |

  9. In the last problem calculate the emf induced in the outer coil if the...

    Text Solution

    |

  10. In the last problem, calculate the force needed to pull out the inner ...

    Text Solution

    |

  11. Two ends of an inductor of inductance L is connected to two parallel c...

    Text Solution

    |

  12. In the circuit shown in Figure, switch S(1) is kept closed and S(2) op...

    Text Solution

    |

  13. A ring is made of a nearly superconducting mate- rial. Inductance of t...

    Text Solution

    |

  14. In the circuit shown, the switch ‘S’ has been closed for a long time a...

    Text Solution

    |

  15. In the circuit shown, switch S(2) is open and S(1) is closed since lon...

    Text Solution

    |

  16. The circuit shown in the figure is used to transfer energy from one ca...

    Text Solution

    |

  17. A pure inductor coil having inductance L is connected to a resistance ...

    Text Solution

    |

  18. The circuit shown in figure has two identical capacitors one of which ...

    Text Solution

    |

  19. The capacitors shown in the circuit have capacitance C(1) = C and C(2)...

    Text Solution

    |

  20. In the circuit shown in figure S(1) is open and, S(2) and S(3) are clo...

    Text Solution

    |