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Day 200: JEE Mains Physics

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

  1. Question 1

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

    13
    If an alpha particle with energy 7.7 MeV is bombarded on a thin gold foil, the closest distance from nucleus it can reach is ____\_\_\_\_ m . (Atomic number of gold =79= 79 and 14πϵ0=9×109\frac{1}{4\pi\epsilon_{0}}= 9 \times10^{9} in SI units)

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  2. Question 2

    Electromagnetic Induction. Asked once: 2021 Paper 23 (same type asked 3 times) See all 3 of this type

    17
    A coil is placed in a magnetic field B→\overrightarrow{B} as shown below: A current is induced in the coil because B→\overrightarrow{B} is:

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  3. Question 3

    Electromagnetic Induction. Asked once: 13 Apr 2023 (same type asked 3 times) See all 3 of this type

    27
    In the given figure, an inductor and a resistor are connected in series with a battery of emf EE volt. Ea2 b J/s\frac{E^{a}}{2\text{ }b}\text{ }J/s represents the maximum rate at which the energy is stored in the magnetic field (inductor). The numerical value of ba\frac{b}{a} will be

  4. Question 4

    Electrostatics. Asked once: 2 Apr 2025 (same type asked 3 times) See all 3 of this type

    19
    A small bob of mass 100 mg and charge +10μC+ 10\mu C is connected to an insulating string of length 1 m . It is brought near to an infinitely long nonconducting sheet of charge density ' σ\sigma ' as shown in figure. If string subtends an angle of 45∘45^{\circ} with the sheet at equilibrium the charge density of sheet will be : (Given, ε0=8.85×10−12 F m\varepsilon_{0}= 8.85 \times10^{- 12}\frac{\text{ }F}{\text{ }m} and acceleration due to gravity, g=10 m/s2g = 10\text{ }m/s^{2} )

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  5. Question 5

    System of Particles and Rotational Motion. Asked once: 28 Jan 2025 (same type asked 3 times) See all 3 of this type

    24
    Two iron solid discs of negligible thickness have radii R1R_{1} and R2R_{2} and moment of inertia I1I_{1} and I2I_{2}, respectively. For R2=2R1R_{2}= 2R_{1}, the ratio of I1I_{1} and I2I_{2} would be 1/x1/x, where x=x = ____\_\_\_\_