Home
Class 12
PHYSICS
The resistance of a coi is 4.2Omega at 1...

The resistance of a coi is `4.2Omega` at `100^(@)C` and the temperature coefficient of resistance of its material is `(0.004)/(.^(@)C)`. Its resistance at `0^(@)C` is

A

`6.5Omega`

B

`5Omega`

C

`3Omega`

D

`2.5Omega`

Text Solution

Verified by Experts

The correct Answer is:
C
`R_(t)=R_(0)(1+alphat)`
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    NARAYNA|Exercise Level 2 C.W|59 Videos

  • CURRENT ELECTRICITY

    NARAYNA|Exercise Level 2 H.W|45 Videos

  • CURRENT ELECTRICITY

    NARAYNA|Exercise Level 1 C.W|64 Videos

  • COMMUNICATION SYSTEM

    NARAYNA|Exercise Level-II(H.W)|25 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    NARAYNA|Exercise ASSERTION AND REASON|15 Videos

Similar Questions

Explore conceptually related problems

If the resistance of a conductor is 5 Omega at 50^(@)C and 7Omega at 100^(@)C then the mean temperature coefficient of resistance of the material is

A tungsten coil has a resistance 16 Omega at 20^@C . If the temperature coefficient of resistance of tungsten is 0.004^@C^(-1) , calculate the resistance of the coil at 80^@C .

The resistance of a metallic conductor is 50Omega at a temperature of 100^(@)C .If its temperature coefficient of resistance is 0.005^(@)C^(-1) ,then its resistance will become 125Omega at a temperature of

A conductor has resistance of 5 Omega at 60^@C and 6 Omega at 100 ^@C . Find (i) the mean temperatures coefficient of resistance of the material of conductor and (ii) resistance at 0^@C .

The resistance of the bulb filament is 100Omega at a temperature of 100^(@)C . If its temperature co-efficient of resistance be 0.005 per 5 ""^(@)C , its resistance will becomes 200 Omega at a temperature

The resistance of a bulb filmanet is 100Omega at a temperature of 100^@C . If its temperature coefficient of resistance be 0.005 per ^@C , its resistance will become 200 Omega at a temperature of

A metal wire of diameter 2 mm and length 100 m has a resistance of 0.5475 Omega " at " 20^(@)C and 0.805 Omega " at " 150^(@)C . Find (i) the temperature of coefficient of resistance (ii) resistance at 0^(@)C (iii) resistivities at 0^(@) and 20^(@)C .

A wire has a resistance of 3.1 Omega at 30°C and a resistance 4.5 Omega at 100°C. The temperature coefficient of resistance of the wire

The resistance of a conductor at 30^@C is 3.25 Omega and at 100^@C is 3.95Omega . Calculate the temperature coefficient of resistance of the conductor and the resistance of the conductor at 0^@C .

NARAYNA-CURRENT ELECTRICITY-Level 1 H.W
  1. When a wire drawn until its radius decreases by 3% then percentage of ...

    Text Solution

    |

  2. When three wires of unequal resistances are given the number of combin...

    Text Solution

    |

  3. The resistance of a coi is 4.2Omega at 100^(@)C and the temperature co...

    Text Solution

    |

  4. You are given several identical resistors each of value 10Omega and ea...

    Text Solution

    |

  5. A wire of resistance 50Omega is cut into six equal parts and they are ...

    Text Solution

    |

  6. A technician has only two resistance coils. By using them in series or...

    Text Solution

    |

  7. The effective between A&B in the given circuit is

    Text Solution

    |

  8. The effective resistance between A and B is 3Omega then the value of R...

    Text Solution

    |

  9. The effective resistance between A and B in the given circuit is

    Text Solution

    |

  10. An electric bulb is rated 220 volt - 100 watt. The power consumed by i...

    Text Solution

    |

  11. A heater coil is cut into two parts of equal length and one of them is...

    Text Solution

    |

  12. if the electrc current in a lamp decreases by 5% then the power output...

    Text Solution

    |

  13. Two electric bulbs whose resistances are in the ratio of 1:2 are conne...

    Text Solution

    |

  14. A bulb rated 60 W-120 V is connected to 80 V mains. What is the curren...

    Text Solution

    |

  15. An electric bulb has the folloiwng specifications 100 watt, 220 volt. ...

    Text Solution

    |

  16. A 200 W and 100 W bulbs, both meant for operation at 220 V, are connec...

    Text Solution

    |

  17. Five bulbs, each rated at 40 W-220 V are used for 5 hours daily on 20 ...

    Text Solution

    |

  18. An electric kettle has two heating coils. When one of them is switched...

    Text Solution

    |

  19. A 10 V storage battery of negligible intenal resistance is connected a...

    Text Solution

    |

  20. A cell of emf 6 V is being charged by 1 A current. If the internalresi...

    Text Solution

    |