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Day 418: JEE Mains Physics

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

  1. Question 1

    Gravitation. Asked once: 29 Jun 2022 (same type asked 14 times) See all 14 of this type

    100
    The time period of a satellite revolving around earth in a given orbit is 7 hours. If the radius of orbit is increased to three times its previous value, then approximate new time period of the satellite will be:

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  2. Question 2

    Electrostatics. Asked once: 8 Apr 2023 (same type asked 12 times) See all 12 of this type

    118
    A 600pF600pF capacitor is charged by 200 V200\text{ }V supply. It is then disconnected from the supply and is connected to another uncharged 600pF600pF capacitor. Electrostatic energy lost in the process is ___μJ\_\_\_\mu J.

  3. Question 3

    Electromagnetic Waves. Asked once: 25 Jul 2022 (same type asked 11 times) See all 11 of this type

    99
    Light wave traveling in air along xx-direction is given by Ey=540sin⁡π×104(x−ct)Vm−1E_{y}= 540\sin\pi \times10^{4}(x - ct)Vm^{- 1}. Then, the peak value of magnetic field of wave will be (Given c=3×108 ms−1c = 3 \times10^{8}{\text{ }ms}^{- 1} )

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  4. Question 4

    Units and Measurements. Asked once: 25 Jul 2022 (same type asked 10 times) See all 10 of this type

    109
    The maximum error in the measurement of resistance, current and time for which current flows in an electrical circuit are 1%,2% and 3% respectively. The maximum percentage error in the detection of the dissipated heat will be:

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  5. Question 5

    Alternating Current. Asked once: 28 Jun 2022 (same type asked 10 times) See all 10 of this type

    30
    A telegraph line of length 100 km100\text{ }km has a capacity of 0.01μFkm\frac{0.01\mu F}{km} and it carries an alternating current at 0.5 kilo cycle per second. If minimum impedance is required, then the value of the inductance that needs to be introduced in series is ____\_\_\_\_ mHmH. (take π=10\pi=\sqrt{10})