Home
Class 12
PHYSICS
A potentiometer wire has length 4 m and ...

A potentiometer wire has length 4 m and resistance `6Omega`. The resistance that must be connected in series with the wire and a battery of emf 4V so as to get a potential gradient 5 mV per cm on the wire is

A

`6Omega`

B

`12Omega`

C

`18Omega`

D

`24Omega`

Text Solution

Verified by Experts

The correct Answer is:
A
`L_(AB)=4mR_(AB)=6OmegaE=4V`
`x=(E/(E+R_(s)))R/Limplies(5xx10^(-3))/(10^(-2))=4/(R+6)6/4`
`impliesR=6Omega`
Promotional Banner

Topper's Solved these Questions

  • NTA TPC JEE MAIN TEST 69

    NTA MOCK TESTS|Exercise PHYSICS|30 Videos

  • NTA TPC JEE MAIN TEST 71

    NTA MOCK TESTS|Exercise PHYSICS|30 Videos

Similar Questions

Explore conceptually related problems

A potentiometer wire has length 8m and resistance 16Omega . The resistance that must be conneted in series with the wire and an accumulator of emf 4V, so as to get a potential gradient of 1mV per cm on the wire is

A potendiometer wire has length 4 m and resistance 8 Omega . The resistance that must be connected in series with the wire and an accumulator of e.m.f. 2 V , so as the get a potential gradient 1 mV per cm on the wire is

A potentiometer wire of length 4 cm has a some resistance. The resistance connected in series with the wire and accumulator of e.m.f. 2V is 16Omega . If the potential gradient along wire is 10^(-3)V//cm . The resistance of potentiometer wire is

A potentiometer wire of length 10m and resistance 20Omega is connected in series with another resistance of 80Omega and a battery of emf 4V . The potential gradient on the wire will be (in mV//cm )

A potentiometer wire has a length 2 m and resistance of 10 Omega . It is coonnected in series with a resistance of 990 Omega and a cell of e.m.f. 2 V. The potential gradient along the wire is

Explain the phenomenon of self induction and mutual induction. Define coefficient of self induction and mutual induction. Write the SI unit and dimensions of coefficient of self induction. A potentiometer wire has a length of 4m and a resistance of 5 Omega . What resistance should be connected in series with a potentiomete-wire and a cell of e.m.f. 2V having internal resistance 1Omega to get a potential gradient of 10^(-3)V//cm ?

The emf of the driver cell of a potentiometer is 2 V , and its internal resistance is negligible. The length of the potentiometer wire is 100 cm , and resistance is 5 omega . How much resistance is to be connected in series with the potentiometer wire to have a potential gradient of 0.05 m V cm^(-1) ?

A potentiometer wire of 10 m length and 20 ohm resistance is connected in series with a resistance R ohms and a battery of emf 2V, negligible internal resistance, potential gradient on the wire is 0.16 millivolt/centimetre then R is ohm….

NTA MOCK TESTS-NTA TPC JEE MAIN TEST 70-PHYSICS
  1. Find the frequency of revolution of the electron in the first stationa...

    Text Solution

    |

  2. A potentiometer wire has length 4 m and resistance 6Omega. The resista...

    Text Solution

    |

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

    Text Solution

    |

  4. A uniform magnetic field of induction B is confined to a cyclindrical ...

    Text Solution

    |

  5. The amplitude of electric field at a distance 2m from a poiont source ...

    Text Solution

    |

  6. When the reverse potential in a semiconductor diode are 10 V and 30 V,...

    Text Solution

    |

  7. Let the junction diode is ideal. The value of current in the figure is

    Text Solution

    |

  8. Two metal spheres having radii in the ratio 3:4 are put into contact a...

    Text Solution

    |

  9. A test particle is moving in a circular orbit in the gravitational fie...

    Text Solution

    |

  10. One mole of O(2) gas is contained in a box of volume V=2m^(3) at press...

    Text Solution

    |

  11. Choose the incorrect stateement about relative magnetic permeability:

    Text Solution

    |

  12. A person B accidentally slips from a large building and screams with a...

    Text Solution

    |

  13. A new unit of length is chosen such that the speed of light in vecuum ...

    Text Solution

    |

  14. A drop of water of radius 0.0015 mm is falling in air .If the coeffici...

    Text Solution

    |

  15. Three lenses of focal length +15cm,+150 cm and +250 cm are available, ...

    Text Solution

    |

  16. The moment of inertia of a body depends upon

    Text Solution

    |

  17. A slab X of thickness 't', thermal conductivity 'K' and area of cross-...

    Text Solution

    |

  18. A Carno'ts heat engine working between the temperature limits 400 K an...

    Text Solution

    |

  19. Two periodic waves of intensities I(1) and I(2) pass through a region ...

    Text Solution

    |

  20. Water is faling on the blades of a turbie at a rate of 300 kg"minute"^...

    Text Solution

    |