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Day 632: JEE Mains Physics

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

  1. Question 1

    Current Electricity. Asked once: 28 Jun 2022

    22
    A meter bridge setup is shown in the figure. It is used to determine an unknown resistance RR using a given resistor of 15Ω15\Omega. The galvanometer (G) shows null deflection when tapping key is at 43 cm43\text{ }cm mark from end AA. If the end correction for end AA is 2 cm2\text{ }cm, then the determined value of RR will be ____\_\_\_\_ Ω\Omega.

  2. Question 2

    Electrostatics. Asked once: 2021 Paper 14

    5
    The electrical permittivity of dielectric varies with xx as:
    ε=ε0[1+kxd];0≤x≤d2\varepsilon=\varepsilon_{0}\left\lbrack 1 +\frac{kx}{d} \right\rbrack;0 \leq x\leq\frac{d}{2}
    =ε0[1+k(d−x)d];d2≤x≤d=\varepsilon_{0}\left\lbrack 1 +\frac{k(d-x)}{d} \right\rbrack;\frac{d}{2}\leq x\leq d
    If the area of the plates in A then find capacitance of capacitor.

    Tap an option to check your answer.

  3. Question 3

    Semiconductor Electronics. Asked once: 2021 Paper 18

    9
    Identify the logic operation carried out by the given circuit: -

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  4. Question 4

    Current Electricity. Asked once: 28 Jun 2022

    115
    All resistances in figure are 1Ω1\Omega each. The value of current ' II ' is a5 A\frac{a}{5}\text{ }A. The value of aa is

  5. Question 5

    Electrostatics. Asked once: 2021 Paper 13

    6
    A long line charge of linear charge density 4×10−5c/m4 \times10^{- 5}c/m is placed along z-axis. An electric dipole of length 2 mm2\text{ }mm is placed along xx-axis. The negative end of dipole is at 10 mm10\text{ }mm and positive end of dipole is at 12 mm12\text{ }mm. The force experienced by dipole is 4 N4\text{ }N. Find the charge of the dipole.

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