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Day 502: JEE Mains Physics

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

  1. Question 1

    Current Electricity. Asked once: 22 Jan 2026 S2

    11
    An electric power line having total resistance of 2Ω2\Omega, delivers 1 kW of power of 250 V . The percentage efficiency of transmission line is ____\_\_\_\_.

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  2. Question 2

    Dual Nature of Radiation and Matter. Asked once: 13 Apr 2023

    112
    An atom absorbs a photon of wavelength 500 nm500\text{ }nm and emits another photon of wavelength 600 nm600\text{ }nm. The net energy absorbed by the atom in this process is n×10−4eVn \times10^{- 4}eV. The value of nn is___ [Assume the atom to be stationary during the absorption and emission process] (Take h=6.6×10−34Jsh = 6.6 \times10^{- 34}Js and c=3×108 m/sc = 3 \times10^{8}\text{ }m/s ).

  3. Question 3

    Electromagnetic Induction. Asked once: 13 Apr 2023

    115
    An insulated copper wire of 100 turns is wrapped around a wooden cylindrical core of the cross-sectional area 24 cm224{\text{ }cm}^{2}. The two ends of the wire are connected to a resistor. The total resistance in the circuit is 12Ω12\Omega. If an externally applied uniform magnetic field in the core along its axis changes from 1.5 T1.5\text{ }T in one direction to 1.5 T1.5\text{ }T in the opposite direction, the charge flowing through a point in the circuit during the change of magnetic field will be___ mCmC.

  4. Question 4

    Electromagnetic Waves. Asked once: 2021 Paper 6

    20
    Red light differs from blue light as they have:

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  5. Question 5

    Electrostatics. Asked once: 22 Jan 2026 S1

    3
    Six point charges are kept 60∘60^{\circ} apart from each other on the circumference of a circle of radius R as shown in figure. The net electric field at the centre of the circle is ____\_\_\_\_ . (ϵo\epsilon_{o} is permittivity of free space)

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