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Day 367: JEE Mains Physics

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

  1. Question 1

    Moving Charges and Magnetism. Asked once: 28 Jul 2022 (same type asked 4 times) See all 4 of this type

    13
    As shown in the figure, a metallic rod of linear density 0.45 kg m−10.45\text{ }kg{\text{ }m}^{- 1} is lying horizontally on a smooth incline plane which makes an angle of 45∘45^{\circ} with the horizontal. The minimum current flowing in the rod required to keep it stationary, when 0.15 T0.15\text{ }T magnetic field is acting on it in the vertical upward direction, will be: {Use  g=10 m/s2}\left. \ g = 10\text{ }m/s^{2} \right\}

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  2. Question 2

    Electrostatics. Asked once: 14 Jun 2022 (same type asked 4 times) See all 4 of this type

    106
    A long cylindrical volume contains a uniformly distributed charge of density ρ\rho. The radius of cylindrical volume is R. A charge particle (q) revolves around the cylinder in a circular path. The kinetic energy of the particle is:

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  3. Question 3

    Wave Optics. Asked once: 2021 Paper 19 (same type asked 4 times) See all 4 of this type

    22
    A source of light is placed in front of a screen. Intensity of light on the screen is I. Two Polaroids P1P_{1} and P2P_{2} are so placed in between the source of light and screen that the intensity of light on screen is I/2I/2. P2P_{2} should be rotated by an angle of ______ (degrees) so that the intensity of light on the screen becomes 3I8\frac{3I}{8}.

  4. Question 4

    Electromagnetic Induction. Asked once: 24 Jan 2023 (same type asked 4 times) See all 4 of this type

    15
    A conducting circular loop of radius 10πcm\frac{10}{\sqrt{\pi}}cm is placed perpendicular to a uniform magnetic field of 0.5 T0.5\text{ }T. The magnetic field is decreased to zero in 0.5 s0.5\text{ }s at a steady rate. The induced emf in the circular loop at 0.25 s0.25\text{ }s is:

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  5. Question 5

    Gravitation. Asked once: 1 Feb 2023 (same type asked 4 times) See all 4 of this type

    109
    The escape velocities of two planets AA and BB are in the ratio 1:21:2. If the ratio of their radii respectively is 1:31:3, then the ratio of acceleration due to gravity of planet A to the acceleration of gravity of planet BB will be:

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