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Day 345: JEE Mains Physics

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

  1. Question 1

    Magnetism and Matter. Asked once: 4 Apr 2024 (same type asked 5 times) See all 5 of this type

    93
    The magnetic moment of a bar magnet is 0.5Am20.5Am^{2}. It is suspended in a uniform magnetic field of 8×10−2 T8\times10^{- 2}\text{ }T. The work done in rotating it from its most stable to most unstable position is:

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  2. Question 2

    Thermal Properties of Matter. Asked once: 2021 Paper 24 (same type asked 5 times) See all 5 of this type

    27
    A steel rod with y=2.0×1011Nm−2y = 2.0 \times10^{11}Nm^{- 2} and α=10−5 ∘C−1\alpha=10^{- 5}\ ^{\circ}C^{- 1} of length 4 m4\text{ }m and area of cross-section 10 cm210{\text{ }cm}^{2} is heated from 0∘C0^{\circ}C to 400∘C400^{\circ}C without being allowed to extend. The tension produced in the rod is x×105 Nx \times10^{5}\text{ }N where the value of xx is

  3. Question 3

    Units and Measurements. Asked once: 2021 Paper 19 (same type asked 5 times) See all 5 of this type

    17
    Match List-I with List-II.
    List-IList-II
    (A) Magnetic Induction(i) ML2 T−2 A−1ML^{2}{\text{ }T}^{- 2}{\text{ }A}^{- 1}
    (B) Magnetic Flux(ii) M0 L−1 AM^{0}{\text{ }L}^{- 1}\text{ }A
    (C) Magnetic Permeability(iii) MT−2 A−1MT^{- 2}{\text{ }A}^{- 1}
    (D) Magnetization(iv) MLT−2 A−2MLT^{- 2}{\text{ }A}^{- 2}
    Choose the most appropriate answer from the options given below:

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  4. Question 4

    Electromagnetic Waves. Asked once: 31 Jan 2023 (same type asked 5 times) See all 5 of this type

    21
    In a medium the speed of light wave decreases to 0.2 times to its speed in free space The ratio of relative permittivity to the refractive index of the medium is x:1x:1. The value of xx is (Given speed of light in free space =3×108 m s−1= 3 \times10^{8}\text{ }m{\text{ }s}^{- 1} and for the given medium μr=1\mu_{r}= 1 )

  5. Question 5

    Electrostatics. Asked once: 29 Jan 2023 (same type asked 5 times) See all 5 of this type

    4
    In a cuboid of dimension 2 L×2 L×L2\text{ }L \times 2\text{ }L \times L, a charge qq is placed at the center of the surface ' SS ' having area of 4 L24{\text{ }L}^{2}. The flux through the opposite surface to ' SS ' is given by

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