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Day 196: JEE Mains Physics

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

  1. Question 1

    Electrostatics. Asked once: 14 Jun 2022 (same type asked 3 times) See all 3 of this type

    8
    A vertical electric field of magnitude 4.9×105 N/C4.9 \times10^{5}\text{ }N/C just prevents a water droplet of a mass 0.1 g0.1\text{ }g from falling. The value of charge on the droplet will be: (Given g=9.8 m/s2g = 9.8\text{ }m/s^{2} )

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  2. Question 2

    System of Particles and Rotational Motion. Asked once: 23 Jan 2025 (same type asked 3 times) See all 3 of this type

    82
    A circular disk of radius RR meter and mass M kgM\text{ }kg is rotating around the axis perpendicular to the disk. An external torque is applied to the disk such that θ(t)=5t2−8t\theta(t) = 5t^{2}- 8t, where θ(t)\theta(t) is the angular position of the rotating disc as a function of time tt. How much power is delivered by the applied torque, when t=2 st = 2\text{ }s ?

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  3. Question 3

    Units and Measurements. Asked once: 28 Jul 2022 (same type asked 3 times) See all 3 of this type

    1
    The dimensions of (B2μ0)\left( \frac{B^{2}}{\mu_{0}} \right) will be: (if μ0\mu_{0} : permeability of free space and BB : magnetic field)

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  4. Question 4

    System of Particles and Rotational Motion. Asked once: 28 Jun 2022 (same type asked 3 times) See all 3 of this type

    119
    A uniform disc with mass M=4 kgM= 4\text{ }kg and radius R=R = 10 cm10\text{ }cm is mounted on a fixed horizontal axle as shown in figure. A block with mass m=2 kgm= 2\text{ }kg hangs from a massless cord that is wrapped around the rim of the disc. During the fall of the block, the cord does not slip and there is no friction at the axle. The tension in the cord is ____\_\_\_\_ N. (Take g=10 ms−2g = 10{\text{ }ms}^{- 2} )

  5. Question 5

    Electrostatics. Asked once: 21 Jan 2026 S1 (same type asked 3 times) See all 3 of this type

    20
    A point charge of 10−8C10^{- 8}C is placed at origin. The work done in moving a point charge 2μC2\mu C from point A(4,4,2)mA(4,4,2)m to B(2,2,1)mB(2,2,1)m is ____\_\_\_\_ J. ( 14πϵ0=9×109\frac{1}{4\pi\epsilon_{0}}= 9 \times10^{9} in SI units)

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