Home
Class 12
PHYSICS
The current, in a potentiometer wire of ...

The current, in a potentiometer wire of 100 cm length, is adjusted to give a null point at 5 cm with standard cell of e.m.f. 1.018 V. The e.m.f. of cell which gives null point of 60 cm is

A

1.221V

B

2.22V

C

3.22V

D

4.22V

Text Solution

Verified by Experts

The correct Answer is:
A
`(E_(1))/(E_(2))=(l_(1))/(l_(2))`
`:.E_(2)=(l_(2))/(l_(1))E_(1)=(60xx10^(-2)xx1.018)/(50xx10^(-2))=1.221V`
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    NIKITA PUBLICATION|Exercise Multiple Choice Questions|314 Videos

  • COMMUNICATION SYSTEMS

    NIKITA PUBLICATION|Exercise Multiple Choice Questions (Examples for Practice)|8 Videos

  • ELASTICITY

    NIKITA PUBLICATION|Exercise MCQ|314 Videos

Similar Questions

Explore conceptually related problems

A potentiometer wire is 10 m long and a P.D. of 6 V is maintained between its ends. The e.m.f. of the cell which balances against a length of 200 cm of the potentiometer wire is

In a potentiometer experiment, the null point is obtained at 140 cm for a cell of e.m.f. 1.2 V. With another cell of unknown e.m.f., the null point is obtained at 210 cm. The unknown e.m.f. is

The length of a potentiometer wire is 200 cm and the e.m.f. of the battery connected to it is E. It is used to measure the e.m.f. of a cell whose internal resistance is 0.5 Omega . If the balance point is obtained at l=40 cm from the positive end, then the e.m.f. of the cell is

A potentiometer wire is 500 cm long and potential difference of 4 V is maintained between the ends of the wire. The e.m.f. of the cell which balances against the length of 135 cm of the wire is

is made of uniform material and cross-sectional area, and it has uniform resistance per unit length. The potential gradient depends upon the current in the wire. A potentiometer with a cell of emf 2 V and internal resistance 0.4 Omega is used across the wire AB . A standard cadmium cell of emf 1.02 V gives a balance point at 66 cm length of wire. The standard cell is then replaced by a cell of unknows emf e (internal resistance r ), and the balance. Point found similarly turns out to be 88 cm length of the wire. The length of potentiometer wire AB is 1 m . The reading of the potentiometer, if a 4V battery is used instead of e is

The length of a potentiometer wire AB is 600 cm , and it carries a constant current of 40 mA from A to B . For a cell of emf 2 V and internal resistance 10 Omega , the null point is found at 500 cm from A . When a voltmeter is connected across the cell, the balancing length of the wire is decreased by 10 cm . Reading of the voltmeter is

NIKITA PUBLICATION-CURRENT ELECTRICITY-Multiple Choice Questions
  1. The internal resistance of a cell by potentiometer is given by

    Text Solution

    |

  2. In potentiometer experiment to determine internal resistance of the ce...

    Text Solution

    |

  3. The current, in a potentiometer wire of 100 cm length, is adjusted to ...

    Text Solution

    |

  4. In given figure, the potentiometer wire AB has a resistance of 5 Omeg...

    Text Solution

    |

  5. The wire of potentiometer has resistance 4 Omega and length 1m. It i...

    Text Solution

    |

  6. A potentiometer has a uniform wire of length 10m and resistance 5 Ome...

    Text Solution

    |

  7. A voltmeter has a resistance of 50 Omega is connected across a cell ...

    Text Solution

    |

  8. With a potentiometer null point were obtained at 140 cm and 180 cm w...

    Text Solution

    |

  9. In a potentiometer experiment it is found that no current passes throu...

    Text Solution

    |

  10. The potential gradient along the length of a uniform wire is 5 V/m. Th...

    Text Solution

    |

  11. In figure AB is a potentiometer wire of length 10 m and resistance 1...

    Text Solution

    |

  12. In figure, AB is a potentiometer wire, length 10 m and resistance 2 Om...

    Text Solution

    |

  13. A plantinum wire has resistance of 10 Omega at 0^(@)C and 20 Omega at ...

    Text Solution

    |

  14. In the adjacent circuit the ammeter reads 5.0 A and voltmeter reads 20...

    Text Solution

    |

  15. Following are the readings of potential and current through a specimen...

    Text Solution

    |

  16. In a potentiometer experiment the balancing length is 8 m, when the tw...

    Text Solution

    |

  17. Six cells each of e.m.f. 2 V and internal resistance 0.1Omega are conn...

    Text Solution

    |

  18. Find the equivalent resistance of the network given in the figure,

    Text Solution

    |

  19. Four identical resistances are joined as shown in the figure. The equi...

    Text Solution

    |

  20. The length and readius of a wire is l and r respectively. Its resist...

    Text Solution

    |