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Day 294: JEE Mains Physics

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

  1. Question 1

    Electromagnetic Waves. Asked once: 11 Apr 2023 (same type asked 4 times) See all 4 of this type

    1
    The electric field in an electromagnetic wave is given as E→=20sin⁡ω(t−xc)j→NC−1\overrightarrow{E}= 20\sin\omega\left( t -\frac{x}{c} \right)\overrightarrow{j}NC^{- 1} Where ω\omega and cc are angular frequency and velocity of electromagnetic wave respectively. The energy contained in a volume of 5×10−4 m35 \times10^{- 4}{\text{ }m}^{3} will be (Given ε0=8.85×10−12C2/Nm2\varepsilon_{0}= 8.85 \times10^{- 12}C^{2}/Nm^{2} )

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  2. Question 2

    System of Particles and Rotational Motion. Asked once: 30 Jan 2024 (same type asked 4 times) See all 4 of this type

    18
    A particle of mass mm projected with a velocity ' uu ' making an angle of 30∘30^{\circ} with the horizontal. The magnitude of angular momentum of the projectile about the point of projection when the particle is at its maximum height hh is :

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  3. Question 3

    Motion in a Plane. Asked once: 29 Jan 2023 (same type asked 4 times) See all 4 of this type

    16
    A stone is projected at angle 30∘30^{\circ} to the horizontal. The ratio of kinetic energy of the stone at point of projection to its kinetic energy at the highest point of flight will be -

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  4. Question 4

    Electrostatics. Asked once: 24 Jan 2023 (same type asked 4 times) See all 4 of this type

    24
    A stream of a positively charged particles having q m=2×1011Ckg\frac{q}{\text{ }m}= 2 \times10^{11}\frac{C}{kg} and velocity v→0=3×107im^s{\overrightarrow{v}}_{0}= 3 \times\frac{10^{7}\widehat{im}}{s} is deflected by an electric field 1.8ȷ^kVm\frac{1.8\widehat{\jmath}kV}{m}. The electric field exists in a region of 10 cm10\text{ }cm along xx direction. Due to the electric field, the deflection of the charge particles in the yy direction___ is mmmm

  5. Question 5

    Electrostatics. Asked once: 29 Jun 2022 (same type asked 4 times) See all 4 of this type

    17
    A parallel plate capacitor filled with a medium of dielectric constant 10, is connected across a battery and is charged. The dielectric slab is replaced by another slab of dielectric constant 15. Then the energy of capacitor will:

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