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Reading of a non-ideal voltmeter across a resistor, or its resistance from the reading

This type of question, asked 5 times: 29 Jun 2022, 24 Jan 2023, 6 Apr 2023, 30 Jan 2024, 24 Jan 2026 S1. All 5 questions below, oldest first.

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  1. Question 1

    29 Jun 2022

    114
    Two resistors are connected in series across a battery as shown in figure. If a voltmeter of resistance 2000Ω2000\Omega is used to measure the potential difference across 500Ω500\Omega resister, the reading of the voltmeter will be ____\_\_\_\_ V.

  2. Question 2

    24 Jan 2023

    98
    A cell of emf 90 V90\text{ }V is connected across series combination of two resistors each of 100Ω100\Omega resistance. A voltmeter of resistance 400Ω400\Omega is used to measure the potential difference across each resistor. The reading of the voltmeter will be:

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  3. Question 3

    6 Apr 2023

    111
    As shown in the figure, the voltmeter reads 2 V2\text{ }V across 5Ω5\Omega resistor. The resistance of the voltmeter is____ Ω\Omega.

  4. Question 4

    30 Jan 2024

    120
    Two resistance of 100Ω100\Omega and 200Ω200\Omega are connected in series with a battery of 4 V4\text{ }V and negligible internal resistance. A voltmeter is used to measure voltage across 100Ω100\Omega resistance, which gives reading as 1 V1\text{ }V. The resistance of voltmeter must be _____Ω\Omega.

  5. Question 5

    24 Jan 2026 S1

    5
    Two resistors of 100Ω100\Omega each are connected in series with a 9 V battery. A voltmeter of 400Ω400\Omega resistance is connected to measure the voltage drop across one of the resistors. The voltmeter reading is ____\_\_\_\_ V.

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