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Day 416: JEE Mains Physics

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

  1. Question 1

    Atoms. Asked once: 2021 Paper 25 (same type asked 7 times) See all 7 of this type

    1
    If λ1\lambda_{1} and λ2\lambda_{2} are the wavelengths of the third member of Lyman and first member of the Paschen series respectively, then the value of λ1:λ2\lambda_{1}:\lambda_{2} is:

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  2. Question 2

    Ray Optics. Asked once: 2021 Paper 7 (same type asked 7 times) See all 7 of this type

    15
    The thickness at the centre of a plano-convex lens is 3 mm3\text{ }mm and the diameter is 6 cm6\text{ }cm. If the speed of light in the material of the lens is 2×108 ms−12\times10^{8}\text{ }ms^{-1}, the focal length of the lens is:

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  3. Question 3

    Wave Optics. Asked once: 28 Jun 2022 (same type asked 7 times) See all 7 of this type

    106
    In young's double slit experiment performed using a monochromatic light of wavelength λ\lambda, when a glass plate (μ=1.5)(\mu = 1.5) of thickness xλx\lambda is introduced in the path of the one of the interfering beams, the intensity at the position where the central maximum occurred previously remains unchanged. The value of xx will be:

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  4. Question 4

    Moving Charges and Magnetism. Asked once: 27 Jun 2022 (same type asked 7 times) See all 7 of this type

    103
    Two long parallel conductors S1S_{1} and S2S_{2} are separated by a distance 10 cm10\text{ }cm and carrying currents of 4 A4\text{ }A and 2 A2\text{ }A respectively. The conductors are placed along XX-axis in X−YX - Y plane. There is a point PP located between the conductors (as shown in figure). A charge particle of 3π3\pi coulomb is passing through the point PP with velocity v→=(2i^+3j^)m/s;\overrightarrow{v}= (2\widehat{i}+ 3\widehat{j})m/s; where i^&j^\widehat{i}\&\widehat{j} represents unit vector along x&yx\& y axis respectively. The force acting on the charge particle is 4π×10−5(−xi^+2j^)N4\pi \times10^{- 5}( - x\widehat{i}+ 2\widehat{j})N. The value of xx is:

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  5. Question 5

    Electromagnetic Induction. Asked once: 2021 Paper 19 (same type asked 7 times) See all 7 of this type

    25
    A circular coil of radius 8.0 cm8.0\text{ }cm and 20 turns is rotated about its vertical diameter with an angular speed of 50rads−150rads^{- 1} in a uniform horizontal magnetic field of 3.0×10−2 T3.0 \times10^{- 2}\text{ }T. The maximum emf induced in the coil will be ______ ×10−2\times10^{- 2} volt (rounded off to the nearest integer)