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Deflection of a moving coil galvanometer: NIAB = k theta

This type of question, asked 3 times: 25 Jan 2023, 27 Jan 2024, 1 Feb 2024. All 3 questions below, oldest first.

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  1. Question 1

    25 Jan 2023

    102
    For a moving coil galvanometer, the deflection in the coil is 0.05rad0.05rad when a current of 10 mA10\text{ }mA is passed through it. If the torsional constant of suspension wire is 4.0×10−5 N mrad−14.0 \times10^{- 5}\text{ }N\text{ }mrad^{- 1}, the magnetic field is 0.01 T0.01\text{ }T and the number of turns in the coil is 200, the area of each turn (in cm2cm^{2} ) is :

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  2. Question 2

    27 Jan 2024

    96
    A current of 200μA200\mu A deflects the coil of a moving coil galvanometer through 60∘60^{\circ}. The current to cause deflection through π10\frac{\pi}{10} radian is:

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  3. Question 3

    1 Feb 2024

    113
    A moving coil galvanometer has 100 turns and each turn has an area of 2.0 cm22.0{\text{ }cm}^{2}. The magnetic field produced by the magnet is 0.01 T0.01\text{ }T and the deflection in the coil is 0.05 radian when a current of 10 mA10\text{ }mA is passed through it. The torsional constant of the suspension wire is x×10−5 N−m/radx \times10^{- 5}\text{ }N - m/rad. The value of xx is _____ .