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Day 112: JEE Mains Physics

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

  1. Question 1

    Units and Measurements. This type asked 2 times: 27 Jun 2022, 5 Apr 2026 S1. This one: 5 Apr 2026 S1 See all 2 of this type

    2
    L, C and R represents physical quantities inductance, capacitance and resistance respectively. The dimensional formula ML2 T−4 A−2ML^{2}{\text{ }T}^{- 4}{\text{ }A}^{- 2} corresponds to

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  2. Question 2

    Electrostatics. This type asked 2 times: 6 Apr 2023, 4 Apr 2026 S2. This one: 4 Apr 2026 S2 See all 2 of this type

    11
    A rigid dipole undergoes a simple harmonic motion about its centre in the presence of an electric field E→1=E0x^{\overrightarrow{E}}_{1}=E_{0}\widehat{x}. If another electric field E→2=2E0(y^+z^){\overrightarrow{E}}_{2}= 2E_{0}(\widehat{y}+\widehat{z}) is introduced to the system, what will be the percentage change in the frequency of the oscillation (approximate) ?

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  3. Question 3

    Mechanical Properties of Solids. This type asked 2 times: 1 Feb 2024, 4 Apr 2026 S2. This one: 4 Apr 2026 S2 See all 2 of this type

    6
    A metal string A is suspended from a rigid support and its free end is attached to a block of mass M. Second block having mass 2 M is suspended at the bottom of the first block using a string B . The area of cross sections of strings A and B are same. The ratio of lengths of strings of AA to BB is 2 and the ratio of their Young's moduli (YA/YB)\left( Y_{A}/Y_{B} \right) is 0.5 . The ratio of elongations in A to B is ____\_\_\_\_ .

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  4. Question 4

    Moving Charges and Magnetism. This type asked 2 times: 2021 Paper 22, 4 Apr 2026 S1. This one: 4 Apr 2026 S1 See all 2 of this type

    16
    An insulated wire is wound so that it forms a flat coil with N=200N = 200 turns. The radius of the innermost turn is r1=3 cmr_{1}= 3\text{ }cm, and of the outermost turn r2=6 cmr_{2}= 6\text{ }cm. If 20 mA current flow in it then the magnetic moment will be α×10−2 A.m2\alpha \times10^{- 2}\text{ }A.m^{2}. The value of α\alpha is ____\_\_\_\_ .

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  5. Question 5

    Ray Optics. This type asked 2 times: 1 Feb 2023, 4 Apr 2026 S1. This one: 4 Apr 2026 S1 See all 2 of this type

    14
    A rod of length 10 cm lies along the principle axis of a concave mirror of focal length 10 cm as shown in figure. The length of the image is ____\_\_\_\_ cm.

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