Home
Class 12
PHYSICS
The resistance of a wire of iron is 10 o...

The resistance of a wire of iron is `10 ohm` and temperature coefficient of resistivity is `5 xx 10^-3//.^@C`, At `20^@C` it carries `30 mA` of current. Keeping constant potential difference between its ends. The temperature of the wire is raised to `120^@C`. The current in `mA` that flows in the wire now is.

A

20

B

15

C

19

D

40

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    ERRORLESS |Exercise Kirchhoff s Law, cells|8 Videos
  • CURRENT ELECTRICITY

    ERRORLESS |Exercise Different Measuring Instruments|1 Videos
  • COMMUNICATION SYSTEM

    ERRORLESS |Exercise S E T|14 Videos
  • ELECTRO MAGNETIC INDUCTION

    ERRORLESS |Exercise SET|20 Videos

Similar Questions

Explore conceptually related problems

A resistance of 20 ohms has a current of 2 amperes flowing in it. What potential difference is there between its ends?

A potential difference of 20 volts is applied across the ends of a resistance of 5 ohms. What current will flow in the resistance?

A silver wire has a temperature coefficient of resistivity 4 xx 10^(-3) .^@C^(-1) and its resistance at 20^@ C is 10^@ Neglecting any change in dimensions due to the change in temperature , its resistance at 40^@C is

The resistance of iron wire is 10Omega and alpha=5xx(10^(-3))/( .^(@)C) . If a current of 30A is flowing in it at 20^(@)C keeping the potential difference across its length constant, if the temperature is incresed to 120^(@)C what is the current flowing through that wire?

Heat produced in a wire of resistance R due to current flowing at constant potential difference is proportional to

The temperature coefficient of resistance of a wire is 0.00125 per ^@C . At 300K, its resistance is 1 ohm. This resistance of the wire will be 2 ohm at.

The resistance of a wire is 5 ohm at 50^@C and 6 ohm at 100^@C . The resistance of the wire at 0^@C will be

There is a cylindrical wire whose temperature coefficient of resistivity is 6 times 10^-3^@C^-1 and co-efficient of linear expansion in 10^-3^@C^-1 . Its temperature coefficient of resistance is N times 10^-3^@c^-1 . Then, the value of N is:

Temperature coefficient of resistance of a wire at 0^(@)C is 0.00125^(@)C^(-1) . At 25^(@)C its resistance is 1 Omega . The resitance of the wire will be 1.2 Omega at

When a current flows in a wire of resistance R at a constan t potential difference, then the value of heat produced by a current is inversely proportional to:

ERRORLESS -CURRENT ELECTRICITY-Self Evaluation Test -19
  1. The resistance of a wire of iron is 10 ohm and temperature coefficient...

    Text Solution

    |

  2. Figure 6.51 shows a simple a potentiometer circuit for measuring a sma...

    Text Solution

    |

  3. A car has a fresh storage battery of emf 12 V and internal resistance ...

    Text Solution

    |

  4. If the balance point is obtained at the 35th cm in a metre bridge the ...

    Text Solution

    |

  5. The equivalent resistance across the terminals of source of e.m.f. 24 ...

    Text Solution

    |

  6. In the circuit shown in figure, switch S is initially closed and S i...

    Text Solution

    |

  7. The figure here shows a portion of a circuit. What are the magnitude a...

    Text Solution

    |

  8. A carbon resistor has colour strips as violet, yellow brown and golden...

    Text Solution

    |

  9. A voltmeter of resistance 1000 Omega is connected across a resistance ...

    Text Solution

    |

  10. A beam contains 2 xx 10^(8) doubly charged positive ions per cubic cen...

    Text Solution

    |

  11. In the circuit shown, the reading of ammeter when switch S is open ...

    Text Solution

    |

  12. In the circuit as shown in figure the

    Text Solution

    |

  13. In figure shows a rectangular block with dimensions x , 2 x and 4 x ....

    Text Solution

    |

  14. A battery is connected to a uniform resistance wire AB and B is eart...

    Text Solution

    |

  15. A cylindrical metal wire of length l and cross sections area S , has...

    Text Solution

    |

  16. A potential divider is used to give outputs of 4 V and 8 V from a 12 V...

    Text Solution

    |

  17. Find equivalent resistance between A and B

    Text Solution

    |

  18. Following figures show four situations in which positive and negative ...

    Text Solution

    |

  19. A and B are two square plates of same metal and same thickness but len...

    Text Solution

    |

  20. A moving coil galvanometer is converted into an ammeter reads upto 0.0...

    Text Solution

    |

  21. Two conductors are made of the same material and have the same length....

    Text Solution

    |