Free physics question bank
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
- 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.
Options
Current Electricity Objective Conversion
Open question & full solution → - MCQmediumCurrent electricity
The resistivity (ρ) of semiconductor varies with temperature. Which of the following curve represents the correct behavior Image
Options
JEE Mains6 April 2023Shift 1Morning Shift
Open question & full solution → - MCQmediumCurrent electricity
A long conductor of circular cross-section has radius r and length ℓ as shown in the figure. The conductivity is σ₁ at the axis and increases linearly with distance from the axis to σ₂ at the surface. Find the resistance of the conductor when current enters through one end and leaves through the other.
Options
JEE Advanced
Open question & full solution → - MCQeasyCurrent electricity
Which of the four graphs shown in the original question correctly represents the variation of resistivity ρ with temperature T for a conductor?
Options
JEE Main 2025 (Online) 22 jan morning Shift
Open question & full solution → - NumericmediumCurrent electricity
A current of 2 A flows through a wire of cross-sectional area 25.0 mm². The free-electron number density is 2.0 × 10²⁸ m⁻³. The drift velocity is ______ × 10⁻⁶ m s⁻¹. [e = 1.6 × 10⁻¹⁹ C]
JEE Mains8 April 2023Shift 1Morning Shift
Open question & full solution → - NumericmediumCurrent electricity
The number density of free electrons in copper is 8 × 10²⁸ m⁻³. A copper wire has cross-sectional area 2 × 10⁻⁶ m² and carries 3.2 A. The drift speed is ______ × 10⁻⁶ m s⁻¹.
JEE Mains8 April 2023Shift 2Evening Shift
Open question & full solution → - Multi-correctmediumCurrent electricity
A metallic conductor of irregular cross-section is as shown in the figure. A constant potential difference is applied across the ends (1) and (2). Then :
Select all that apply
JEE Advanced
Open question & full solution → - NumericmediumCurrent electricity
A cylindrical conductor of length 2m and area of cross-section 0.2 mm² carries an electric current of 1.6 A when its ends are connected to a 2V battery. Mobility of electrons in the conductor is α × 10⁻³ m²/V.s. The value of α is :
(electron concentration = 5 × 10²⁸/m³ and electron charge = 1.6 × 10⁻¹⁹ C)
JEE Mains 202622 January Evening Shift
Open question & full solution → - NumericmediumCurrent electricity
A wire of resistance R and radius r is stretched till its radius became r/2. If new resistance of the stretched wire is xR, then value of x is _________.
JEE Mains 2024 06 Apr Morning Shift
Open question & full solution → - NumericdifficultCurrent electricity
A copper wire of length 5 cm carries a current of density j = 1 A(mm)⁻². The density and molar mass of copper are 9000 kg m⁻³ and 63 g mol⁻¹. Each copper atom contributes one free electron. The temperature of the wire is 27°C. Estimate the (average) distance travelled by a free electron during the time it moves from one end of the copper wire to the other end. Assume that thermal motion of electrons are similar to that of molecules of an ideal gas. Give the answer in kilometres, rounded to nearest integer.
Current Electricity Objective Conversion
Open question & full solution →