Home
Class 12
PHYSICS
Potentiometer measures the potential dif...

Potentiometer measures the potential difference more accurately than a voltmeter, because

A

it has a wire resistance

B

it has a wire of low resistance

C

it does not draw current from external circuit

D

it draws a heavy current from external circuit

Text Solution

Verified by Experts

The correct Answer is:
A
When we measure the emf of a cell by the potentiometer then no current flows in the circuit in zero-deflection condition i.e., cell is in open circuit. Thus, in this condition the actual value of a cell is found. In this way, potentiometer is equivalent to an ideal voltmeter of infinite resistance.
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise EXERCISE 2|26 Videos

  • COMMUNICATION SYSTEM

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise MHC CET Corner|6 Videos

  • ELASTICITY

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise MHT CET CORNER|16 Videos

Similar Questions

Explore conceptually related problems

Potentiometer is better for measuring the potential difference than the voltmeter because

The unit for measuring potential difference is:

A current of I mA is flowing through a resistance of 1000 Omega . To measure the potential difference across it, a voltmeter should be used whose resistance is

A voltmeter reads the potential difference across the terminals of an old battery as 1.40 V , while a potentiometer reads its voltage to be 1.55 V . The voltmeter resistance is 280 Omega .

MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-CURRENT ELECTRICITY-MHT CET CORNER
  1. When a resistance of 100Omega is connected in series with a galvanomet...

    Text Solution

    |

  2. A 2 V battery, a 990Omega resistor and a potentiometer of 2 m length, ...

    Text Solution

    |

  3. The resistance of an ammeter is 13 Omega and its scale is graduated fo...

    Text Solution

    |

  4. A galvanometer of resistance 50Omega is connected to a b attery of 3V ...

    Text Solution

    |

  5. Potentiometer measures the potential difference more accurately than a...

    Text Solution

    |

  6. The cell has an emf of 2 V and the internal resistance of this cell is...

    Text Solution

    |

  7. Is it possible that any battery has some constant valur of emf, but th...

    Text Solution

    |

  8. To get maximum current through a resistance of 2.5Omega, one can use ...

    Text Solution

    |

  9. A potential difference is applied across the ends of a metallic wire. ...

    Text Solution

    |

  10. A current of 0.01 mA passes through the potentiometer wire of a resist...

    Text Solution

    |

  11. A thick wire is stretched so that its length become two times. Assumin...

    Text Solution

    |

  12. The length of the resistance wire is increased by 10%. What is the cor...

    Text Solution

    |

  13. If three resistors of resistance 2Omega, 4Omega and 5 Omega are connec...

    Text Solution

    |

  14. What is the magnitude of the current l in the circuit given? (in the...

    Text Solution

    |

  15. Two wires of same material have length L and 2 L and cross– sectional...

    Text Solution

    |

  16. The resistance of a 5 cm long wire is 10Omega . It is uniformly stret...

    Text Solution

    |

  17. The effective resistance of two resistors in parallel is (12)/(7) Om...

    Text Solution

    |

  18. A series combination of two resistors 1 Omega each is connected to a 1...

    Text Solution

    |

  19. Electromotive force is the force, which is able to maintain a constant

    Text Solution

    |

  20. A battery of e mf 10 V and internal resistance 3Omega is connected to ...

    Text Solution

    |