A battery of internal resistance \(r\), when connected across \(2~\Omega\) resistor supplies a current of \(4~\text{A}\). When the battery is connected across a \(5~\Omega\) resistor, it supplies a current of \(2~\text{A}\). The value of \(r\) is:

1. | \(2~\Omega\) | 2 | \(1~\Omega\) |

3. | \(0.5~\Omega\) | 4. | zero |

Subtopic: EMF & Terminal Voltage |

83%

From NCERT

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A student measures the terminal potential difference \(V\) of a cell (of emf \( E\) and internal resistance \(R\)) as a function of the current \(I\) flowing through it. The slope and intercept of the graph between \(V\) and \(I\), respectively, is equal to:

1. \(E\) and \(-r\)

2. \(-r\) and \(E\)

2. \(-r\) and \(E\)

3. \(r\) and \(-E\)

4. \(-E\) and \(r\)

Subtopic: EMF & Terminal Voltage |

69%

From NCERT

AIPMT - 2009

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A battery is charged at a potential of \(15\) V for \(8\) hours when the current flowing is \(10\) A. The battery on discharge supplies a current of \(5\) A for \(15\) hours. The mean terminal voltage during discharges is \(14\) V. The "Watt hour" efficiency of the battery is:

1. \(80\%\)

2. \(90\%\)

3. \(87.5\%\)

4. \(82.5\%\)

Subtopic: EMF & Terminal Voltage |

68%

From NCERT

AIPMT - 2004

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A battery of emf \(E\) and internal resistance \(r\) is connected to a variable resistor \(R\) as shown below. Which one of the following is true?

** **

1. | Potential difference across the terminals of the battery is maximum when \(R=r\). |

2. | Power delivered to the resistor is maximum when \(R=r\). |

3. | Current in the circuit is maximum when \(R=r\). |

4. | Current in the circuit is maximum when \(R>>r\). |

Subtopic: EMF & Terminal Voltage |

64%

From NCERT

PMT - 1995

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