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Internal resistance or emf of a cell from readings with two loads or a voltmeter

This type of question, asked 4 times: 2021 Paper 13, 14 Jun 2022, 11 Apr 2023, 5 Apr 2026 S2. All 4 questions below, oldest first.

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  1. Question 1

    2021 Paper 13

    23
    A cell of emf E is attached in a circuit having 5 ohms and 2 ohms resistor one by one. PD across 5 ohms comes out to be 1.25 V1.25\text{ }V and across 2 ohms as 1 volt. If E=x10E=\frac{x}{10}, then find xx.

  2. Question 2

    14 Jun 2022

    3
    Two identical cells each of emf 1.5 V1.5\text{ }V are connected in parallel across a parallel combination of two resistors each of resistance 20Ω20\Omega. A voltmeter connected in the circuit measures 1.2 V1.2\text{ }V. The internal resistance of each cell is

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  3. Question 3

    11 Apr 2023

    114
    Two identical cells each of emf 1.5 V1.5\text{ }V are connected in series across a 10Ω10\Omega resistance. An ideal voltmeter connected across 10Ω10\Omega resistance reads 1.5 V1.5\text{ }V. The internal resistance of each cell is ___Ω\_\_\_\Omega.

  4. Question 4

    5 Apr 2026 S2

    24
    When an external resistance of 5Ω5\Omega is connected across terminals of a cell, a current of 0.25 A flows through it. When the 5Ω5\Omega resistor is replaced by a 2Ω2\Omega resistor, a current of 0.5 A flows through it. The internal resistance of the cell is ____\_\_\_\_ Ω\Omega.