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Day 164: JEE Mains Physics

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

  1. Question 1

    Electromagnetic Waves. Asked once: 4 Apr 2025 (same type asked 5 times) See all 5 of this type

    98
    If an optical medium possesses a relative permeability of 10π\frac{10}{\pi} and relative permittivity of 10.0885\frac{1}{0.0885}, then the velocity of light is greater in vacuum than that in this medium by ____\_\_\_\_ times. (μ0=4π×10−7H/m,ϵ0=8.85×10−12 F/m)\left( \mu_{0} = 4\pi \times 10^{- 7}H/m,\epsilon_{0} = 8.85 \times 10^{- 12}\text{ }F/m \right), c=3×108 m/sc = 3 \times 10^{8}\text{ }m/s ).

  2. Question 2

    Electromagnetic Waves. Asked once: 30 Jan 2024 (same type asked 5 times) See all 5 of this type

    109
    Match List I with List II
    List-IList-II
    A. Gauss's law of magnetostaticsI. ∮E→⋅da→=1ε0∫ρ dV\oint \overrightarrow{E}\cdot\overrightarrow{da} = \frac{1}{\varepsilon_{0}}\int \rho\, dV
    B. Faraday's law of electromagnetic inductionII. ∮B→⋅da→=0\oint \overrightarrow{B}\cdot\overrightarrow{da} = 0
    C. Ampere's lawIII. ∮E→⋅dl→=−ddt∫B→⋅da→\oint \overrightarrow{E}\cdot\overrightarrow{dl} = -\frac{d}{dt}\int \overrightarrow{B}\cdot\overrightarrow{da}
    D. Gauss's law of electrostaticsIV. ∮B→⋅dl→=μ0I\oint \overrightarrow{B}\cdot\overrightarrow{dl} = \mu_{0}I
    Choose the correct answer from the options given below:

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  3. Question 3

    Electrostatics. Asked once: 22 Jan 2025 (same type asked 5 times) See all 5 of this type

    2
    A line charge of length a2\frac{a}{2} is kept at the center of an edge BCBC of a cube ABCDEFGHABCDEFGH having edge length ' aa ' as shown in the figure. If the density of line is λC\lambda C per unit length, then the total electric flux through all the faces of the cube will be (Take ϵ0\epsilon_{0} as the free space permittivity)

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  4. Question 4

    Wave Optics. Asked once: 4 Apr 2025 (same type asked 5 times) See all 5 of this type

    5
    In a Young's double slit experiment, the slits are separated by 0.2 mm . If the slits separation is increased to 0.4 mm , the percentage change of the fringe width is:

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  5. Question 5

    Dual Nature of Radiation and Matter. Asked once: 3 Apr 2025 (same type asked 5 times) See all 5 of this type

    15
    The work function of a metal is 3 eV . The color of the visible light that is required to cause emission of photoelectrons is

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