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Day 47: JEE Mains Physics

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

  1. Question 1

    Electrostatics. This type asked 4 times: 28 Jul 2022, 24 Jan 2023, 25 Jan 2023, 22 Jan 2025. This one: 22 Jan 2025 See all 4 of this type

    9
    An electron is made to enter symmetrically between two parallel and equally but oppositely charged metal plates, each of 10 cm length. The electron emerges out of the field region with a horizontal component of velocity 106 m/s10^{6}\text{ }m/s. If the magnitude of the electric field between the plates is 9.1 V/cmV/cm, then the vertical component of velocity of electron is (mass of electron =9.1×10−31 kg= 9.1 \times10^{- 31}\text{ }kg and charge of electron =1.6×10−19C= 1.6 \times10^{- 19}C )

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  2. Question 2

    Electrostatics. This type asked 4 times: 2021 Paper 23, 29 Jun 2022, 4 Apr 2024, 22 Jan 2025. This one: 22 Jan 2025 See all 4 of this type

    19
    A parallel-plate capacitor of capacitance 40μ F40\mu\text{ }F is connected to a 100 V power supply. Now the intermediate space between the plates is filled with a dielectric material of dielectric constant K=2K = 2. Due to the introduction of dielectric material, the extra charge and the change in the electrostatic energy in the capacitor, respectively, are -

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  3. Question 3

    Moving Charges and Magnetism. This type asked 4 times: 26 Jul 2022, 27 Jan 2024, 8 Apr 2024, 22 Jan 2025. This one: 22 Jan 2025 See all 4 of this type

    96
    A proton is moving undeflected in a region of crossed electric and magnetic fields at a constant speed of 2×105 ms−12 \times10^{5}{\text{ }ms}^{- 1}. When the electric field is switched off, the proton moves along a circular path of radius 2 cm . The magnitude of electric field is x×104 N/Cx \times10^{4}\text{ }N/C. the value of x is ______\_\_\_\_\_\_ Take the mass of the proton =1.6×10−27 kg= 1.6 \times10^{- 27}\text{ }kg.

  4. Question 4

    Laws of Motion. This type asked 4 times: 26 Jul 2022, 31 Jan 2024, 6 Apr 2024, 9 Apr 2024. This one: 9 Apr 2024 See all 4 of this type

    8
    A light unstretchable string passing over a smooth light pulley connects two blocks of masses m1m_{1} and m2m_{2}. If the acceleration of the system is g8\frac{g}{8}, then the ratio of the masses m2 m1\frac{m_{2}}{{\text{ }m}_{1}} is:

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  5. Question 5

    Mechanical Properties of Solids. This type asked 4 times: 28 Jul 2022, 24 Jan 2023, 6 Apr 2023, 9 Apr 2024. This one: 9 Apr 2024 See all 4 of this type

    27
    Two persons pull a wire towards themselves. Each person exerts a force of 200 N200\text{ }N on the wire. Young's modulus of the material of wire is 1×1011 N m−21 \times10^{11}\text{ }N{\text{ }m}^{- 2}. Original length of the wire is 2 m2\text{ }m and the area of cross section is 2 cm22{\text{ }cm}^{2}. The wire will extend in length by ___ μm\mu m.