Current Electricity: JEE Main Physics Previous Year Questions

723 previous year questions from Current Electricity. Here are the 25 most important ones; open any question for the correct answer and a full step-by-step solution.

1. $What equal length of an iron wire and a copper-nickel alloy wire, each of 2mm diameter connected parallel to give an equivalent resistance of 3Ω ? (Given resistiv\dots$
2. $The Kirchhoff’s first law (\sum i = 0) and second law (\sum iR = \sum E), where the symbols have their usual meanings, are respectively based on$
3. $When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be$
4. $Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 volt and the average resistance\dots$
5. $A wire of resistance 4 Ω is stretched to twice its original length. The resistance of stretched wire would be:$
6. $If the last band on the carbon resistor is absent, then the tolerance is$
7. $When 5V potential difference is applied across a wire of length 0.1 m, the drift speed of electrons is 2.5 \times 1 0^{-4} m s^{-1} . If the electron density in the wire is 8\dots$
8. $A uniform heating wire of resistance 36Ω is connected across a potential difference of 240V. The wire is then cut into half and potential difference of 240V is a\dots$
9. $A conductor wire having 10^{29} free electrons / m^{3} carries a current of 20 A . If the cross-section of the wire is 1 mm^{2}, then t\dots$
10. $The charge flowing through a resistance R varies with time t as Q = at - b t^{2}, where a and b are positive constants. The total heat produced in R is:$
11. $Two heaters A and B have power rating of 1 kW and 2 kW respectively. Those two are first connected in series and then in parallel to a fixed power source. The ratio of po\dots$
12. $Three resistances each of 4 Ω are connected to form a triangle. The resistance between any two terminals is$
13. $A current of 200 μA deflects the coil of a moving coil galvanometer through 60^{\circ} . The current to cause deflection through \frac{π}{10} radian i\dots$
14. $A heating coil is labelled 100 W, 220 V The coil is cut in half and the two pieces are joined in parallel to the same source. The energy now liberated per second is$
15. $A wire of resistance 4 Ω is stretched to twice its original length. The resistance of stretched wire would be$
16. $A set of n equal resistors, of value R each are connected in series to a battery of emf E and internal resistance R. The current drawn is I. Now, the n resistors are conn\dots$
17. $In a large building, there are 15 bulbs of 40W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW. The voltage of the electric mains is 220 V. The minimum capacity of\dots$
18. $A current of 5A is passing through a non-linear magnesium wire of cross-section 0. 04 m^{2} . At every point the direction of current density is at an angle of 600 with th\dots$
19. $The resistivity of potentiometer wire is 40 \times 10^{- 8} Ωm metre and its area of cross-section is 8 \times 10^{- 6} m^{2} . If 0.2 ampere current i\dots$
20. $Two resistances are connected in the two gaps of a meter bridge. The balancing point is obtained at 20 cm . When a resistance of 15Ω is connected\dots$
21. $A resistor develops 300 J of thermal energy in 15s, when a current of 2A is passed through it. If the current increases to 3A, the energy developed in 10s is_________J.$
22. $Two bulbs of (40 W, 200 V), and (100 W, 200 V) . Then correct relation for their resistances$
23. $A resistor has a colour code of green, blue, brown and silver. What is its resistance?$
24. $Water boils in an electric kettle in 20 minutes after being switched on. Using the same main supply, the length of the heating element should be_____to ____times of its i\dots$
25. $The resistances of the four arms P, Q, R and S in a Wheatstone’s bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cel\dots$

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Current Electricity: JEE Main Physics Previous Year Questions

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