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Day 78: JEE Mains Physics

5 questions. Try each one first, then open its answer.

  1. Question 1

    Work, Energy and Power. This type asked 3 times: 2021 Paper 6, 25 Jul 2022, 1 Feb 2024. This one: 1 Feb 2024 See all 3 of this type

    16
    A simple pendulum of length 1 m1\text{ }m has a wooden bob of mass 1 kg1\text{ }kg. It is struck by a bullet of mass 10−2 kg10^{- 2}\text{ }kg moving with a speed of 2×102 ms−12 \times10^{2}{\text{ }ms}^{- 1}. The bullet gets embedded into the bob. The height to which the bob rises before swinging back is. (use g=10 m/s2g = 10\text{ }m/s^{2} )

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  2. Question 2

    Moving Charges and Magnetism. This type asked 3 times: 6 Apr 2023, 30 Jan 2024, 31 Jan 2024. This one: 31 Jan 2024 See all 3 of this type

    116
    Two circular coils PP and QQ of 100 turns each have same radius of πcm\pi cm. The currents in PP and QQ are 1 A1\text{ }A and 2 A2\text{ }A respectively. PP and QQ are placed with their planes mutually perpendicular with their centers coincide. The resultant magnetic field induction at the center of the coils is xmT\sqrt{x}mT, where x=x = _______ .[Use μ0=4π×10−7TmA−1\mu_{0}= 4\pi\times10^{- 7}TmA^{- 1} ]

  3. Question 3

    Alternating Current. This type asked 3 times: 29 Jul 2022, 8 Apr 2023, 29 Jan 2024. This one: 29 Jan 2024 See all 3 of this type

    18
    A capacitor of capacitance 100μF100\mu F is charged to a potential of 12 V12\text{ }V and connected to a 6.4mH6.4mH inductor to produce oscillations. The maximum current in the circuit would be:

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  4. Question 4

    Moving Charges and Magnetism. This type asked 3 times: 2021 Paper 22, 27 Jun 2022, 29 Jan 2024. This one: 29 Jan 2024 See all 3 of this type

    14
    The deflection in moving coil galvanometer falls from 25 divisions to 5 division when a shunt of 24Ω24\Omega is applied. The resistance of galvanometer coil will be :

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  5. Question 5

    System of Particles and Rotational Motion. This type asked 3 times: 2021 Paper 5, 2021 Paper 25, 27 Jan 2024. This one: 27 Jan 2024 See all 3 of this type

    26
    Four particles each of mass 1 kg1\text{ }kg are placed at four corners of a square of side 2 m. Moment of inertia of system about an axis perpendicular to its plane and passing through one of its vertex is ___ kgm2kgm^{2}.