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Day 336: JEE Mains Physics

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

  1. Question 1

    Moving Charges and Magnetism. Asked once: 27 Jan 2024 (same type asked 6 times) See all 6 of this type

    28
    Two long, straight wires carry equal currents in opposite directions as shown in figure. The separation between the wires is 5.0 cm. The magnitude of the magnetic field at a point PP midway between the wires is ______ μT\mu T (Given: μ0=4π×10−7TmA−1\mu_{0}= 4\pi \times10^{- 7}TmA^{- 1} )

  2. Question 2

    Units and Measurements. Asked once: 23 Jan 2025 (same type asked 6 times) See all 6 of this type

    16
    The electric flux is ϕ=ασ+βλ\phi = \alpha\sigma + \beta\lambda where λ\lambda and σ\sigma are linear and surface charge density, respectively, (αβ)\left( \frac{\alpha}{\beta} \right) represents

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  3. Question 3

    Mechanical Properties of Solids. Asked once: 8 Apr 2023 (same type asked 6 times) See all 6 of this type

    8
    An aluminium rod with Young's modulus Y=7.0Y = 7.0 ×1010 N/m2\times10^{10}\text{ }N/m^{2} undergoes elastic strain of 0.04%0.04\%. The energy per unit volume stored in the rod in SI unit is:

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  4. Question 4

    Gravitation. Asked once: 29 Jul 2022 (same type asked 6 times) See all 6 of this type

    22
    If the acceleration due to gravity experienced by a point mass at a height hh above the surface of earth is same as that of the acceleration due to gravity at a depth αh(h<<Re\alpha h\left( h < <R_{e} \right. ) from the earth surface. The value of α\alpha will be (use Re=6400 kmR_{e}= 6400\text{ }km )

  5. Question 5

    Semiconductor Electronics. Asked once: 29 Jul 2022 (same type asked 6 times) See all 6 of this type

    118
    A 8 V8\text{ }V Zener diode along with a series resistance RR is connected across a 20 V20\text{ }V supply (as shown in the figure). If the maximum Zener current is 25 mA25\text{ }mA, then the minimum value of RR will be ____\_\_\_\_ Ω\Omega.