Current Electricity – JEE Main 2026 Quiz

Q1. A mobile battery is rated 4.2 V, 5800 mAh. Energy stored when fully charged is:

Q2. Two cells of emf 1 V and 2 V with internal resistances 2Ω and 1Ω are connected in series with a 6Ω resistor. If (I₁ / I₂) = x / 3 when cells are connected in parallel, find x.

Q3. A wire of resistance R and radius r is stretched so that its radius becomes r/2. New resistance becomes xR. Find x.

Q4. Number of electrons flowing per second in a 110 W bulb operating at 220 V is (e = 1.6×10⁻¹⁹ C):

Q5. A toaster of resistance 60Ω at 27°C draws 2.75 A at 220 V. The temperature attained is approximately (α = 2×10⁻⁴/°C):

Q6. Resistance of a wire at 0°C, 100°C and t°C are 10Ω, 10.2Ω and 10.95Ω. Temperature t in Kelvin is:

Q7. In a meter bridge experiment, balancing length remains unchanged when wire resistance per cm is doubled. The balancing length is:

Q8. Percentage change in resistance if length increases by 20% and area decreases by 4% is:

Q9. Shunt resistance needed with a galvanometer (30Ω, 20 mA) to measure 3 A current is:

Q10. Internal resistance of a battery measured using potentiometer is approximately: