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Balanced Wheatstone bridge: unknown resistance or current when the bridge arm carries no current

This type of question, asked 4 times: 28 Jun 2022, 30 Jan 2023, 6 Apr 2024, 28 Jan 2025. All 4 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    28 Jun 2022

    23
    Current measured by the ammeter (a) in the reported circuit when no current flows through 10Ω10\Omega resistance will be ____\_\_\_\_ A.

  2. Question 2

    30 Jan 2023

    112
    If the potential difference between BB and DD is zero, the value of xx is 1nΩ\frac{1}{n}\Omega. The value of nn is____

  3. Question 3

    6 Apr 2024

    9
    The value of unknown resistance (x) for which the potential difference between BB and DD will be zero in the arrangement shown, is:

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  4. Question 4

    28 Jan 2025

    99
    The value of current I in the electrical circuit as given below, when potential at A is equal to the potential at BB, will be ______\_\_\_\_\_\_ A.