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Day 237: JEE Mains Physics

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

  1. Question 1

    Electrostatics. Asked once: 13 Apr 2023 (same type asked 2 times) See all 2 of this type

    26
    A thin infinite sheet charge and an infinite line charge of respective charge densities +σ+ \sigma and +λ+ \lambda are placed parallel at 5 m5\text{ }m distance from each other. Points ' PP ' and ' QQ ' are at 3πm\frac{3}{\pi}m and 4πm\frac{4}{\pi}m perpendicular distance from line charge towards sheet charge, respectively. ' EPE_{P} ' and ' EQE_{Q} ' are the magnitudes of resultant electric field intensities at point ' PP ' and ' QQ ', respectively. If EPEQ=4a\frac{E_{P}}{E_{Q}}=\frac{4}{a} for 2∣σ∣=∣λ∣2|\sigma| = |\lambda|. Then the value of aa is____

  2. Question 2

    Laws of Motion. Asked once: 30 Jan 2024 (same type asked 2 times) See all 2 of this type

    99
    A block of mass mm is placed on a surface having vertical cross section given by y=x2/4y=x^{2}/4. If coefficient of friction is 0.5 , the maximum height above the ground at which block can be placed without slipping is:

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  3. Question 3

    Motion in a Plane. Asked once: 28 Jun 2022 (same type asked 2 times) See all 2 of this type

    3
    Motion of a particle in x−yx - y plane is described by a set of following equations x=4sin⁡(π2−ωt)mx = 4\sin\left( \frac{\pi}{2}- \omega t \right)m and y=4sin⁡(ωt)my = 4\sin(\omega t)m. The path of particle will be -

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  4. Question 4

    Oscillations. Asked once: 27 Jun 2022 (same type asked 2 times) See all 2 of this type

    100
    The equation of a particle executing simple harmonic motion is given by x=sin⁡π(t+13)mx = \sin\pi\left( t +\frac{1}{3} \right)m. At t=1 st = 1\text{ }s, the speed of particle will be ____\_\_\_\_ cm s−1cm\ s^{- 1} (Given: π=3.14\pi = 3.14 )

  5. Question 5

    Alternating Current. Asked once: 30 Jan 2024 (same type asked 2 times) See all 2 of this type

    111
    A power transmission line feeds input power at 2.3 kVkV to a step -down transformer with its primary winding having 3000 turns. The output power is delivered at 230 V230\text{ }V by the transformer. The current in the primary of the transformer is 5 A5\text{ }A and its efficiency is 90%90\%. The winding of transformer is made of copper. The output current of transformer is _____ A.