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Day 614: JEE Mains Physics

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

  1. Question 1

    Current Electricity. Asked once: 6 Apr 2023

    95
    Figure shows a part of an electric circuit. The potentials at points a,ba,b and cc are 30 V,12 V30\text{ }V,12\text{ }V and 2 V2\text{ }V respectively. The current through the 20Ω20\Omega resistor will be.

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  2. Question 2

    Electrostatics. Asked once: 26 Jul 2022

    105
    A source of potential difference VV is connected to the combination of two identical capacitors as shown in the figure. When key ' KK ' is closed, the total energy stored across the combination is E1E_{1}. Now key ' KK ' is opened and dielectric of dielectric constant 5 is introduced between the plates of the capacitors. The total energy stored across the combination is now E2E_{2}. The ratio E1/E2E_{1}/E_{2} will be:

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  3. Question 3

    Semiconductor Electronics. Asked once: 29 Jul 2022

    30
    If the potential barrier across a p-n junction is 0.6 V0.6\text{ }V. Then the electric field intensity, in the depletion region having the width of 6×10−6 m6 \times10^{- 6}\text{ }m, will be ___×105 N/C\_\_\_\times10^{5}\text{ }N/C.

  4. Question 4

    Current Electricity. Asked once: 6 Apr 2023

    22
    The length of a metallic wire is increased by 20%20\% and its area of cross section is reduced by 4%4\%. The percentage change in resistance of the metallic wire is___

  5. Question 5

    Electrostatics. Asked once: 25 Jul 2022

    96
    Capacitance of an isolated conducting sphere of radius R1R_{1} becomes nn times when it is enclosed by a concentric conducting sphere of radius R2R_{2} connected to earth. The ratio of their radii (R2R1)\left( \frac{R_{2}}{R_{1}} \right) is:

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