Home
Class 12
PHYSICS
With a potentiometer null point were obt...

With a potentiometer null point were obtained at 140 cm and 180 cm with cells of emf 1.1 V and one unknown `chi` volts. Unknown emf is

A

0.1V

B

1.21V

C

1.414V

D

1.8V

Text Solution

Verified by Experts

The correct Answer is:
C
`(E_(1))/(E_(2))=(l_(1))/(l_(2))`
`:.E_(2)=(l_(2))/(l_(1))E_(1)=(180xx1.1)/(140)=1.414V`
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

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

In an experiment to find the internal resistance of a cell by a potentiometer, a balance was obtained for 50 cm length of the potentiometer wire, with a cell of e.m.f. 2V. When the cell was shunted by a resistance of 2 Omega , the balancing length of the potentiometer wire was 40 cm. What was the internal resistance of the cell ?

In a metre bridge experiment, unknown resistance X and known resistance of 60Omega is connected in left and right gap of a metre bridge respectively. If the null point is obtained at 40 cm from the left end then the unknown resistance is

An unknown resistance 'X' is placed in the left gap and and a known resistance of 60Omega is plaecd in the right gap of metre bridge. The null point is obtained at 40 cm from the left end fo the bridge. Fid the unknown resistance.

In a potentiometer of one metre length, an unknown emf voltage source is balanced at 60 cm length of potentiometer wire, while a 3 volt battery is balanced at 45 cm length. The the emf of the unknown voltage source is.

An unknown resistance is placed in the left gap and resistance of 50 ohm is placed in the right gap of a meter bridge . The null point is obtained at 40 cm from the left end. Determine the unknown resistance.

The length of the potentiometer wire is 600 cm and a current of 40 mA is flowing in it. When a cell of emf 2 V and internal resistance 10Omega is balanced on this potentiometer the balance length is found to be 500 cm. The resistance of potentiometer wire will be

NIKITA PUBLICATION-CURRENT ELECTRICITY-Multiple Choice Questions
  1. A potentiometer has a uniform wire of length 10m and resistance 5 Ome...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  16. A copper wire of length 1 m and radius is joined in series with an iro...

    Text Solution

    |

  17. The internal resistance of a primary cell is 4 Omega . It generates a...

    Text Solution

    |

  18. A capacitor of 10 mu F has a potential difference of 40 V across it....

    Text Solution

    |

  19. The resistance of a conductor is 5Omega at 50^(@)C and 6Omega at 100^...

    Text Solution

    |

  20. In an electrical cable there is a single wire of radius 9 mm of copper...

    Text Solution

    |