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Electric Current, Drift Velocity & Resistance questions with solutions
Practice Current electricity for JEE Main, JEE Advanced, NEET, and Classes 11–12. Attempt each question, then open it for the full solution.
Showing 1–10 of 45 questions
- MCQmediumCurrent electricity
Two resistances of equal magnitude R and having temperature coefficients α₁ and α₂ respectively are connected in parallel. The temperature coefficient of the parallel combination is, approximately:
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JEE MainsNEET
Open question & full solution → - MCQmediumCurrent electricity
Statement I: Equivalent resistance of resistors in series is smaller than the least resistance in the combination.
Statement II: Resistivity of a material is independent of temperature. Choose the correct option.
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15 April 2023 Morning Shift
Open question & full solution → - MCQmediumCurrent electricity
An insulating pipe of cross-section area 'A' contains an electrolyte which has two types of ions→ their charges being -e and +2e. A potential difference applied between the ends of the pipe result in the drifting of the two types of ions, having drift speed = v (-ve ion) and v/4 (+ve ion). Both ions have the same number per unit volume = n. The current flowing through the pipe is
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JEE MainsNEET
Open question & full solution → - MCQeasyCurrent electricity
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:
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JEE Mains 2024 31 Jan Morning Shift
Open question & full solution → - NumericmediumCurrent electricity
A resistance R with temperature coefficient α is connected in parallel with a resistance 3R having temperature coefficient 2α. If the effective temperature coefficient is α(eff) = (k/4)α, find k.
JEE Mains
Open question & full solution → - NumericmediumCurrent electricity
A hollow cylindrical conductor has length of 3.14 m, while its inner and outer diameters are 4 mm and 8 mm respectively. The resistance of the conductor is n × 10⁻³ Ω. If the resistivity of the material is 2.4 × 10⁻⁸ Ωm. The value of n is ______ .
JEE Mains 2023 24 jan morning shift
Open question & full solution → - ParagraphmediumCurrent electricity
For a cylindrical conductor of radius R and cross-sectional area A = πR², answer the following two current-density questions.
Sub-question 1
The current density varies as J = J₀(1 - r/R). The total current is:
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Sub-question 2
If instead J = J₀r/R, the total current is:
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JEE Advanced
Open question & full solution → - MCQmediumCurrent electricity
A metal wire of cross-sectional area 0.5 mm² and length 100 m is connected across a battery of e.m.f. 2 V and internal resistance 1 Ω. The density, atomic mass and electrical conductivity of the metal are 6.35 × 10³ kg m⁻³, 63.5 g mol⁻¹ and 2 × 10⁸ S m⁻¹, respectively. Assuming one conduction electron per atom of the metal, the drift velocity (in mm s⁻¹) of the electrons in the wire is: [Take Avogadro’s number as 6 × 10²³ and charge of the electron as 1.6 × 10⁻¹⁹ C.]
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JEE Advanced2026Paper 2
Open question & full solution → - MCQdifficultCurrent electricity
A conducting plate of thickness t is in the shape of an arc. Its inner and outer rim form a 30° arc of radius r and 2r respectively at point O (see Figure). Electric current flows through the strip along circular arcs as indicated in the diagram. Find resistance of the plate if its material has conductivity σ.
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Current Electricity Objective Conversion
Open question & full solution → - MCQmediumCurrent electricity
A uniform metallic wire carries a current 2 A when a 3.4 V battery is connected across it. The mass of the wire is 8.92 × 10⁻³ kg, density is 8.92 × 10³ kg m⁻³ and resistivity is 1.7 × 10⁻⁸ Ω m. The length of wire is:
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JEE Mains25 January 2023Morning Shift
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