Home
Class 12
PHYSICS
Resistance of 100 cm long potentiometer ...

Resistance of 100 cm long potentiometer wire is `10 Omega`, it is connected to a battery (2 volt) and a resistance R in series. A source of 10 mV gives null point at 40 cm length, then external resistance R is

A

`490 Omega`

B

`790 Omega`

C

`590 Omega`

D

`990 Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
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

Residence of 100 cm long potentiometer wire is 10 Omega , it is connected to a battery (2 volt) and a resistance R in series. A source of 10 mV gives null point at 40 cm length, then external resistance R is

To the potentiometer wire of L and 10Omega resistance, a battery of emf 2.5 volts and a resistance R are connected in series. If a potential difference of 1 volt is balanced across L/2 length, the value of R is Omega will be

AB is a potentiometer wire of length 100 cm and its resistance is 10 Omega . It is connected in series with a battery of emf 2V and resistance 40 Omega . If a source of unknown emf E is balanced by 40 cm length of the potentiometer wire, the value of E is :-

A potentiometer wire has length 10m and resistance 10Omega . It is connected to battery of EMF 11 volt and internal resistance 1Omega , then the potential gradient in the wire is

In the given figure, battery E is balanced on 55 cm length of potentiometer wire but when a resistance of 10Omega is connected in parallel with the battery then it balances on 50 cm length of the potentiometer wire then internal resistance r of the battery is

In fig. battery E is balanced on 55cm length of potentiometer wire but when a resistance of 10Omega is connected in parallel with the battery then it balances on 50cm length of the potentiometer wire then internal resistance r of the battery is:-

The resistance of a 50 cm long wire is 10 Omega . The wire is stretched of uniform wire of length 100 cm. The resistance now will be

A potentiometer wire has resistance 40Omega and its length is 10m. It is connected by a resistance of 760Omega in series if emf of battery is 2V then potential gradient is:-

The potentiometer wire 10m long and 20 ogm resistance is connected to a 3 volt emf battery and a 10ohm resistance. The value of potential gradient in volt/m of the wire will be

ERRORLESS -CURRENT ELECTRICITY-Self Evaluation Test -19
  1. Resistance of 100 cm long potentiometer wire is 10 Omega, it is connec...

    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

    |