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Day 153: JEE Mains Physics

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

  1. Question 1

    Moving Charges and Magnetism. Asked once: 22 Jan 2025 (same type asked 6 times) See all 6 of this type

    97
    Two long parallel wires X and Y , separated by a distance of 6 cm , carry currents of 5 A and 4 A , respectively, in opposite directions as shown in the figure. Magnitude of the resultant magnetic field at point PP at a distance of 4 cm from wire Y is x×10−5 Tx \times10^{- 5}\text{ }T. The value of xx is ______\_\_\_\_\_\_ . Take permeability of free space as μ0=4π×10−7\mu_{0}= 4\pi \times10^{- 7} SI units.

  2. Question 2

    Units and Measurements. Asked once: 21 Jan 2026 S1 (same type asked 6 times) See all 6 of this type

    7
    Consider a modified Bernoulli equation.
    (P+ABt2)+ρg( h+Bt)+12ρ V2= constant \left( P +\frac{A}{Bt^{2}} \right)+ \rho g(\text{ }h + Bt) +\frac{1}{2}\rho{\text{ }V}^{2}=\text{~constant~}
    If t has the dimension of time then the dimensions of A and B are ____\_\_\_\_ , ____\_\_\_\_ respectively.

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  3. Question 3

    Mechanical Properties of Solids. Asked once: 2 Apr 2025 (same type asked 6 times) See all 6 of this type

    22
    A steel wire of length 2 m and Young's modulus 2.0×1011Nm−22.0 \times 10^{11}{Nm}^{- 2} is stretched by a force. If Poisson ratio and transverse strain for the wire are 0.2 and 10−310^{- 3} respectively, then the elastic potential energy density of the wire is α×105\alpha \times 10^{5} (in SI units). The value of α\alpha is ____\_\_\_\_.

  4. Question 4

    Gravitation. Asked once: 29 Jan 2024 (same type asked 6 times) See all 6 of this type

    17
    At what distance above and below the surface of the earth a body will have same weight, (take radius of earth as R.)

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  5. Question 5

    Semiconductor Electronics. Asked once: 24 Jan 2026 S1 (same type asked 6 times) See all 6 of this type

    23
    A voltage regulating circuit consisting of Zener diode, having break-down voltage of 10 V and maximum power dissipation of 0.4 W , is operated at 15 V . The approximate value of protective resistance in this circuit is ____\_\_\_\_ Ω\Omega.