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Day 639: JEE Mains Physics

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

  1. Question 1

    Current Electricity. Asked once: 2021 Paper 18

    16
    What equal length of an iron wire and a copper-nickel alloy wire, each of 2 mm2\text{ }mm diameter connected parallel to give an equivalent resistance of 3Ω3\Omega? (Given resistivities of iron and copper-nickel alloy wire are 12μΩcm12\mu\Omega cm and 51μΩcm51\mu\Omega cm respectively)

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  2. Question 2

    Current Electricity. Asked once: 2021 Paper 17

    27
    For the circuit shown, the value of current at time t=3.2 st = 3.2\text{ }s will be ____\_\_\_\_ A. [Voltage distribution V(t)V(t) is shown by Fig. (1) and the circuit is shown in Fig. (2)]

  3. Question 3

    Current Electricity. Asked once: 2021 Paper 11

    13
    A current of 5 A5\text{ }A is flowing through magnesium wire. The current density is making an angle of 60∘60^{\circ} with Area vector. Find the electric field. (Given: Area =2m2,ρ== 2m^{2},\rho= Resistivity of Magnesium =11×10−4= 11 \times10^{- 4} SI units)

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  4. Question 4

    Current Electricity. Asked once: 2021 Paper 9

    15
    In the experiment of Ohm's law, a potential difference of 5.0 V5.0\text{ }V is applied across the end of a conductor of length 10.0 cm10.0\text{ }cm and diameter of 5.00 mm5.00\text{ }mm. The measured current in the conductor is 2.00 A. The maximum permissible percentage error in the resistivity of the conductor is:

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  5. Question 5

    Current Electricity. Asked once: 2021 Paper 8

    13
    The four arms of a Wheatstone bridge have resistances as shown in the figure. A galvanometer of 15Ω15\Omega resistance is connected across BD. Calculate the current through the galvanometer when a potential difference of 10 V10\text{ }V is maintained across AC.

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