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Current and voltage sensitivity of a moving coil galvanometer

This type of question, asked 6 times: 28 Jul 2022, 31 Jan 2023, 10 Apr 2023, 11 Apr 2023, 23 Jan 2025, 2 Apr 2025. All 6 questions below, oldest first.

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  1. Question 1

    28 Jul 2022

    12
    The current sensitivity of a galvanometer can be increased by: (A) decreasing the number of turns (B) increasing the magnetic field (C) decreasing the area of the coil (D) decreasing the torsional constant of the spring Choose the most appropriate answer from the options given below:

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  2. Question 2

    31 Jan 2023

    97
    The number of turns of the coil of a moving coil galvanometer is increased in order to increase current sensitivity by 50%50\%. The percentage change in voltage sensitivity of the galvanometer will be:

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  3. Question 3

    10 Apr 2023

    8
    Given below are two statement: Statement I: If the number of turns in the coil of a moving coil galvanometer is doubled then the current sensitivity becomes double. Statement II: Increasing current sensitivity of a moving coil galvanometer by only increasing the number of turns in the coil will also increase its voltage sensitivity in the same ratio: In the light of the above statement, choose the correct answer from the options given below:

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  4. Question 4

    11 Apr 2023

    14
    The current sensitivity of moving coil galvanometer is increased by 25%25\%. This increase is achieved only by changing wire while keeping the resistance of galvanometer coil constant. The percentage change in the voltage sensitivity will be:

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  5. Question 5

    23 Jan 2025

    10
    Consider a moving coil galvanometer (MCG) : (A) The torsional constant in moving coil galvanometer has dimensions [ML2 T−2]\left\lbrack ML^{2}{\text{ }T}^{- 2} \right\rbrack (BB) Increasing the current sensitivity may not necessarily increase the voltage sensitivity. (C) If we increase number of turns (N)(N) to its double (2 N)(2\text{ }N), then the voltage sensitivity doubles. (D) MCG can be converted into an ammeter by introducing a shunt resistance of large value in parallel with galvanometer. (E) Current sensitivity of MCG depends inversely on number of turns of coil. Choose the correct answer from the options given below :

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  6. Question 6

    2 Apr 2025

    77
    In a moving coil galvanometer, two moving coils M1M_{1} and M2M_{2} have the following particulars:
    R1=5Ω, N1=15, A1=3.6×10−3 m2, B1=0.25 TR_{1}= 5\Omega,{\text{ }N}_{1}= 15,{\text{ }A}_{1}= 3.6 \times10^{- 3}{\text{ }m}^{2},{\text{ }B}_{1}= 0.25\text{ }T
    R2=7Ω, N2=21, A2=1.8×10−3 m2, B2=0.50 TR_{2}= 7\Omega,{\text{ }N}_{2}= 21,{\text{ }A}_{2}= 1.8 \times10^{- 3}{\text{ }m}^{2},{\text{ }B}_{2}= 0.50\text{ }T
    Assuming that torsional constant of the springs are same for both coils, what will be the ratio of voltage sensitivity of M1M_{1} and M2M_{2} ?

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