Current electricity questions with solutions

Showing 1–10 of 143 questions

• Multi-correctdifficultCurrent electricitycircuit theory

  In the circuit shown in Figure B1, B2 and B3 are identical bulbs and C is a parallel plate capacitor.
  

  

  Select all that apply

  • Option A

    In steady state, B1 is brightest

  • Option B

    In steady state, B2 and B3 have equal brightness

  • Option C

    While plate separation increases, B3 glows temporarily

  • Option D

    While plate separation increases, B2 becomes dimmer temporarily

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• MCQmediumCurrent electricitycircuit theory

  The value of unknown resistance (x) for which the potential difference between B and D will be zero in the arrangement shown, is :

  

  Options

  • Option A

    3 Ω

  • Option B

    9 Ω

  • Option C

    6 Ω

  • Option D

    42 Ω

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  JEE Mains 2024 06 Apr Morning Shift

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• MCQeasyCurrent electricitycombination of cells and maximum power theorem

  A mobile-phone battery is rated 4.2 V, 5800 mAh. The energy stored when fully charged is:

  Options

  • Option A

    48.7 kJ

  • Option B

    43.8 kJ

  • Option C

    87.7 kJ

  • Option D

    24.4 kJ

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  JEE Mains 2025 2 April Morning Shift

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• IntegermediumCurrent electricitycombination of cells and maximum power theorem

  Two cells of emfs 1 V and 2 V and internal resistances 2 Ω and 1 Ω, respectively, are connected in parallel with the same polarity and supply a current of 1 A through an external resistance R. The polarity of the 1 V cell is then reversed while the external resistance remains unchanged. If the new current through R is α ÷ 5 A, find α.

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  JEE Mains 2026 6 April Evening Shift

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• MCQeasyCurrent electricityelectric current ,current density and resistance

  If the percentage errors in measuring the length and the diameter of a wire are 0.1% each, the percentage error in measuring its resistance will be:

  Options

  • Option A

    0.2%

  • Option B

    0.3%

  • Option C

    0.1%

  • Option D

    0.144%

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  JEE Mains 2024 31 Jan Morning Shift

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• MCQeasyCurrent electricitycombination of cells and maximum power theorem

  An electric bulb rated 50 W – 200 V is connected across a 100 V supply. The power dissipation of the bulb is:

  Options

  • Option A

    12.5 W

  • Option B

    25 W

  • Option C

    50 W

  • Option D

    100 W

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  JEE Mains 2024 04 Apr Evening Shift

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• MCQeasyCurrent electricityelectric current ,current density and resistance

  Current through a wire varies with time as I(t) = 0.02t + 0.01 A. The charge flowing through the wire from t = 1 s to t = 2 s is:

  Options

  • Option A

    0.02 C

  • Option B

    0.04 C

  • Option C

    0.06 C

  • Option D

    0.07 C

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  JEE Mains 2025 4 April Morning Shift

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• MCQeasyCurrent electricitycircuit theory

  Which one of the following is not a measurable quantity ?

  Options

  • Option A

    Voltage difference

  • Option B

    Resistance

  • Option C

    Voltage

  • Option D

    Displacement current

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  JEE Mains 202628 January Evening Shift

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• NumericmediumCurrent electricityequivalent resistance

  Equivalent resistance of the following network is _____ Ω.

  

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  JEE Mains 2024 31 Jan Morning Shift

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• NumericeasyCurrent electricityelectric instruments

  In a meter bridge experiment to determine the value of unknown resistance, first the resistances 2 Ω and 3 Ω are connected in the left and right gaps of the bridge and the null point is obtained at a distance l cm from the left. Now when an unknown resistance x Ω is connected in parallel to 3 Ω resistance, the null point is shifted by 10 cm to the right of wire. The value of unknown resistance x is ___ Ω.

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  JEE Mains 202624 January Evening Shift

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