Home
Class 12
PHYSICS
Length of a potentiometer wire is kept l...

Length of a potentiometer wire is kept long and uniform to ahcieve:-

Text Solution

Verified by Experts

The correct Answer is:
`x = (3a)/(4)`
`x_(cm) = (int xdm)/(int dm) = (int_(0)^(a) xrhoydx)/(int_(0)^(a) rhoydx) = (3)/(4)a`
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    ALLEN |Exercise EXERCISE-IV B|14 Videos

  • CURRENT ELECTRICITY

    ALLEN |Exercise EXERCISE-V A|20 Videos

  • CURRENT ELECTRICITY

    ALLEN |Exercise EXERCISE-III|26 Videos

  • CIRCULAR MOTION

    ALLEN |Exercise EXERCISE (J-A)|6 Videos

  • GEOMETRICAL OPTICS

    ALLEN |Exercise subjective|14 Videos

Similar Questions

Explore conceptually related problems

Resistivity of the mateial of potentiometer wire is (rho) and area of its uniform cross section is A, Hence potential gradient on the wire is = ..... .

potentiometer wire made of manganin because it has

If the length of a given conducting wire is kept constant and its diameter is doubled, what will be the resistance of the new wire?

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:-

A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f. E_(0) and a resistance r_(1) . An unknown e.m.f E is balaned at a length l of the potentiometer wire. The e.m.f E will be given by :

If specific resistance of a potentiometer wire is 10^(–7 ) Omega m , the current flow through it is 0.1 A and the cross-sectional area of wire is 10^(–6) m^(2) then potential gradient will be

The resistance of a 10 m long potentiometer wire is 20 Omega . It is connected in series with a 3 V battery and 10 Omega resistor. The potential difference between two points separated by distance 30 cm is equal to .......

A potentiometer having the potential gradient of 2 mV//cm is used to measure the difference of potential across a resistance of 10 ohm . If a length of 50 cm of the potentiometer wire is required to get null point, the current passing through the 10 ohm resistor is (in mA )

The length of a wire of a potentiometer is 100 cm, and the e.m.f. of its standard cell is E volt. It is employed to measure the e.m.f. of a battery whose internal resistance is 0.5 Omega . If the balance point is obtained at I = 30 cm from the positive end, the e.m.f. of the battery is . where i is the current in the potentiometer wire.

ALLEN -CURRENT ELECTRICITY-EXERCISE-IV A
  1. N identical cells whether joined together in series or in parallel, gi...

    Text Solution

    |

  2. The potential difference between the points A and B in the following c...

    Text Solution

    |

  3. Length of a potentiometer wire is kept long and uniform to ahcieve:-

    Text Solution

    |

  4. A body is projected up such that its position vector varies with time ...

    Text Solution

    |

  5. Find the equivalent resistance across AB :

    Text Solution

    |

  6. There are three voltmeters of the same range but of resistance 10000 O...

    Text Solution

    |

  7. In the circuit element given here, if the potential at point B = V(B) ...

    Text Solution

    |

  8. A copper wire has a square cross-section, 2.0 mm on a side. It carr...

    Text Solution

    |

  9. The emf of a battery is 2V and its internal resistance is 0.5Omega the...

    Text Solution

    |

  10. The potential difference across the 100 Omega resistance in the follow...

    Text Solution

    |

  11. The equivalent resistance between the point P and Q in the network giv...

    Text Solution

    |

  12. When connected across the terminals of a cell, a voltmeter measures 5 ...

    Text Solution

    |

  13. Thirteen resistances each of resistance R ohm are connected in the cir...

    Text Solution

    |

  14. A group of N cells whose emf varies directly with the internal resista...

    Text Solution

    |

  15. A galvanometer has resistance 36Omega if a shunt of 4Omega is added wi...

    Text Solution

    |

  16. If 10^(6) electrons/s are flowing through an area of cross section of ...

    Text Solution

    |

  17. The terminal voltage is (E)/(2) when a current of 2A is flowing throug...

    Text Solution

    |

  18. A 1Omega voltmeter has range 1V find the additional resistance which h...

    Text Solution

    |

  19. The length of a given cylindrical wire is increased by 100%. Due to th...

    Text Solution

    |

  20. The length of a wire of a potentiometer is 100 cm, and the e.m.f. of i...

    Text Solution

    |