Home
Class 12
PHYSICS
A resistance R is connected across a cel...

A resistance R is connected across a cell of emf `epsilon` and internal resistance r. A potentiometer now measures the potential difference between the terminals of the cell as V. Write the expression for 'r' in terms of `epsilon`, V and R.

Promotional Banner

Topper's Solved these Questions

  • ELECTRIC CURRENT. RESISTANCE AND E.M.F

    MODERN PUBLICATION|Exercise EXERCISE|64 Videos

  • DISPERSION

    MODERN PUBLICATION|Exercise EXERCISE|54 Videos

  • ELECTRIC FIELD

    MODERN PUBLICATION|Exercise EXERCISE|95 Videos

Similar Questions

Explore conceptually related problems

A cell of e.m.f E is connected across a resistance r. The potential differene between the terminals of the cell is found to be V. The internal resistance fo the cell must be

A cell of emf 2 V and internal resistance 0.1Omega is connected to 3.9Omega external resistance. What will be the potential difference across the terminals of the cell?

A current of 2.0 A passes through a cell of emf 1.5 V having internal resistance of 0.15 Omega . The potential difference (measured in volt) across both the terminals of the cell is

A cell of emf 2 V and internal resistance 0.1Ohm is connected to a 20 Ohm resistor .What is the current in the circuit ?

n cells of e.m.f E and internal resistance r are connected in series with an external resistance R . the current will increase n times that of a single cell, if

If the combination is connected to a battery of e.m.f. 12 V and negligible internal resistance, obtain the potential drop across each resistor.

MODERN PUBLICATION-ELECTRIC CURRENT. RESISTANCE AND E.M.F-EXERCISE
  1. A resistance R is connected across a cell of emf epsilon and internal ...

    Text Solution

    |

  2. What is drift velocity of electrons? How do you explain the flow of cu...

    Text Solution

    |

  3. Derive an expressions between drift velocity of elctron and electric c...

    Text Solution

    |

  4. Define drift velocity of electricity and establish its relation with v...

    Text Solution

    |

  5. Explain the term drift velocity of electrons. Hence obtain the express...

    Text Solution

    |

  6. Prove that the current density of a metallic conductor is directly pro...

    Text Solution

    |

  7. Define 'relaxation time' in a conductor. Explain how it varies with in...

    Text Solution

    |

  8. What is the effect of temperature on relaxation time in a metal?

    Text Solution

    |

  9. Derive an expression for drift velocity of free electrons in a conduct...

    Text Solution

    |

  10. Define relaxation time of the electrons drifting in a conductor. How i...

    Text Solution

    |

  11. What is drift velocity?

    Text Solution

    |

  12. What are ohmic and non-ohmic resistors? Give one example of each.

    Text Solution

    |

  13. Deduce Ohm's law using the concept of drift velocity.

    Text Solution

    |

  14. Discuss the various situations, which describe the failure of Ohm's la...

    Text Solution

    |

  15. Resistance of a conductor depends on:

    Text Solution

    |

  16. Resistance of a conductor depends on:

    Text Solution

    |

  17. On what factors resistivity of the material depend?

    Text Solution

    |

  18. Explain how the resistivity of a conductor depends upon relaxation tim...

    Text Solution

    |

  19. Define 'relaxation time' in a conductor. Explain how it varies with in...

    Text Solution

    |

  20. Define the term resistivity and write its S.I. unit. Derive the expres...

    Text Solution

    |

  21. What do you understand by electrical resistivity and give its relation...

    Text Solution

    |