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Day 583: JEE Mains Physics

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

  1. Question 1

    Electrostatics. Asked once: 31 Jan 2024

    117
    The distance between charges +q+ q and −q- q is 2l2l and between +2q+ 2q and −2q- 2q is 4l4l. The electrostatic potential at point PP at a distance rr from centre OO is −α[qlr2]×109 V-\alpha\left\lbrack \frac{ql}{r^{2}} \right\rbrack\times10^{9}\text{ }V, where the value of α\alpha is ______ (Use 14πε0=9×109Nm2C−2\frac{1}{4\pi\varepsilon_{0}}= 9 \times10^{9}Nm^{2}C^{- 2} )

  2. Question 2

    Laws of Motion. Asked once: 25 Jun 2022

    113
    A block of mass 200 g200\text{ }g is kept stationary on a smooth inclined plane by applying a minimum horizontal force F=xNF =\sqrt{x}N as shown in figure. The value of x=x =

  3. Question 3

    Motion in a Plane. Asked once: 2021 Paper 25

    14
    A particle is moving with uniform speed along the circumference of a circle of radius RR under the action of a central fictitious force FF which is inversely proportional to R3R^{3}. Its time period of revolution will be given by:

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  4. Question 4

    Motion in a Straight Line. Asked once: 25 Jun 2022

    92
    Two buses PP and QQ start from a point at the same time and move in a straight line and their positions are represented by XP(t)=αt+βt2X_{P}(t) = \alpha t + \beta t^{2} and XQ(t)=ft−t2X_{Q}(t) = ft -t^{2}. At what time, both the buses have same velocity?

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  5. Question 5

    Ray Optics. Asked once: 25 Jul 2022

    16
    Time taken by light to travel in two different materials AA and BB of refractive indices μA\mu_{A} and μB\mu_{B} of same thickness is t1t_{1} and t2t_{2} respectively. If t2−t1=5×10−10 st_{2}-t_{1}= 5 \times10^{- 10}\text{ }s and the ratio of μA\mu_{A} to μB\mu_{B} is 1:21:2. Then the thickness of material, in meter is : (Given vAv_{A} and vBv_{B} are velocities of light in AA and BB materials respectively).

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