Current Electricity PYQs - Last 5 Years
JEE Main / Physics / Electricity / 193 recent questions
PhysicsElectricity2022-2026
Practice 193 JEE Main Physics questions from Current Electricity. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.
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Last 5 Years Current Electricity Questions
Showing 50 of 193 filtered questions.
1Current Electricity
The effective resistance between \(A\) and \(B\), if resistance of each resistor is \(R\), will be :
MCQ+4 / -12024
2Current Electricity
To determine the resistance (R) of a wire, a circuit is designed below. The \(V\)-\(I\) characteristic curve for this circuit is plotted for the voltmeter and the ammeter readings as shown in figure. The value of $R$ is _________ \(\Omega\)...
INTEGER+4 / -12024
3Current Electricity
At room temperature \((27^{\circ} \mathrm{C})\), the resistance of a heating element is \(50 \Omega\). The temperature coefficient of the material is \(2.4 \times 10^{-4}{ }^{\circ} \mathrm{C}^{-1}\). The temperature of the element, when it...
INTEGER+4 / -12024
4Current Electricity
In the given circuit, the terminal potential difference of the cell is :
MCQ+4 / -12024
5Current Electricity
Resistance of a wire at \(0^{\circ} \mathrm{C}, 100^{\circ} \mathrm{C}\) and \(t^{\circ} \mathrm{C}\) is found to be \(10 \Omega, 10.2 \Omega\) and \(10.95 \Omega\) respectively. The temperature \(t\) in Kelvin scale is _________.
INTEGER+4 / -12024
6Current Electricity
A heater is designed to operate with a power of \(1000 \mathrm{~W}\) in a \(100 \mathrm{~V}\) line. It is connected in combination with a resistance of \(10 \Omega\) and a resistance \(R\), to a \(100 \mathrm{~V}\) mains as shown in figure....
INTEGER+4 / -12024
7Current Electricity
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 initial length if the water is to be boiled in 15 minutes.
MCQ+4 / -12024
8Current Electricity
The value of unknown resistance \((x)\) for which the potential difference between \(B\) and \(D\) will be zero in the arrangement shown, is :
MCQ+4 / -12024
9Current 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 \(x ~R\), then value of \(x\) is ________.
INTEGER+4 / -12024
10Current Electricity
In the given figure an ammeter A consists of a \(240 \Omega\) coil connected in parallel to a \(10 \Omega\) shunt. The reading of the ammeter is ________ \(\mathrm{mA}\).
INTEGER+4 / -12024
11Current Electricity
The number of electrons flowing per second in the filament of a \(110 \mathrm{~W}\) bulb operating at \(220 \mathrm{~V}\) is : (Given \(\mathrm{e}=1.6 \times 10^{-19} \mathrm{C}\))
MCQ+4 / -12024
12Current Electricity
In the given figure \(\mathrm{R}_1=10 \Omega, \mathrm{R}_2=8 \Omega, \mathrm{R}_3=4 \Omega\) and \(\mathrm{R}_4=8 \Omega\). Battery is ideal with emf \(12 \mathrm{~V}\). Equivalent resistant of the circuit and current supplied by battery ar...
MCQ+4 / -12024
13Current Electricity
In the experiment to determine the galvanometer resistance by half-deflection method, the plot of \(1 / \theta\) vs the resistance (R) of the resistance box is shown in the figure. The figure of merit of the galvanometer is _________ $$\tim...
INTEGER+4 / -12024
14Current Electricity
The ratio of heat dissipated per second through the resistance \(5 \Omega\) and \(10 \Omega\) in the circuit given below is:
MCQ+4 / -12024
15Current Electricity
A wire of resistance \(20 \Omega\) is divided into 10 equal parts, resulting pairs. A combination of two parts are connected in parallel and so on. Now resulting pairs of parallel combination are connected in series. The equivalent resistan...
INTEGER+4 / -12024
16Current Electricity
A galvanometer of resistance \(100 \Omega\) when connected in series with \(400 \Omega\) measures a voltage of upto \(10 \mathrm{~V}\). The value of resistance required to convert the galvanometer into ammeter to read upto $$10 \mathrm{~A}$...
MCQ+4 / -12024
17Current Electricity
Twelve wires each having resistance \(2 \Omega\) are joined to form a cube. A battery of \(6 \mathrm{~V}\) emf is joined across point \(a\) and \(c\). The voltage difference between \(e\) and \(f\) is ________ V.
INTEGER+4 / -12024
18Current Electricity
To measure the internal resistance of a battery, potentiometer is used. For \(R=10 \Omega\), the balance point is observed at \(l=500 \mathrm{~cm}\) and for \(\mathrm{R}=1 \Omega\) the balance point is observed at \(l=400 \mathrm{~cm}\). Th...
MCQ+4 / -12024
19Current Electricity
An electric bulb rated \(50 \mathrm{~W}-200 \mathrm{~V}\) is connected across a \(100 \mathrm{~V}\) supply. The power dissipation of the bulb is:
MCQ+4 / -12024
20Current Electricity
Two wires \(A\) and \(B\) are made up of the same material and have the same mass. Wire \(A\) has radius of \(2.0 \mathrm{~mm}\) and wire \(B\) has radius of \(4.0 \mathrm{~mm}\). The resistance of wire \(B\) is \(2 \Omega\). The resistance...
INTEGER+4 / -12024
21Current Electricity
Equivalent resistance of the following network is __________ \(\Omega\).
INTEGER+4 / -12024
22Current Electricity
Two conductors have the same resistances at \(0^{\circ} \mathrm{C}\) but their temperature coefficients of resistance are \(\alpha_1\) and \(\alpha_2\). The respective temperature coefficients for their series and parallel combinations are ...
MCQ+4 / -12024
23Current Electricity
In the following circuit, the battery has an emf of \(2 \mathrm{~V}\) and an internal resistance of \(\frac{2}{3} \Omega\). The power consumption in the entire circuit is _________ W.
INTEGER+4 / -12024
24Current Electricity
The resistance per centimeter of a meter bridge wire is \(r\), with \(X \Omega\) resistance in left gap. Balancing length from left end is at \(40 \mathrm{~cm}\) with \(25 \Omega\) resistance in right gap. Now the wire is replaced by anothe...
MCQ+4 / -12024
25Current Electricity
By what percentage will the illumination of the lamp decrease if the current drops by 20%?
MCQ+4 / -12024
26Current Electricity
Two cells are connected in opposition as shown. Cell \(\mathrm{E}_1\) is of \(8 \mathrm{~V}\) emf and \(2 \Omega\) internal resistance; the cell \(\mathrm{E}_2\) is of \(2 \mathrm{~V}\) emf and \(4 \Omega\) internal resistance. The terminal...
INTEGER+4 / -12024
27Current Electricity
An electric toaster has resistance of \(60 \Omega\) at room temperature \(\left(27^{\circ} \mathrm{C}\right)\). The toaster is connected to a \(220 \mathrm{~V}\) supply. If the current flowing through it reaches \(2.75 \mathrm{~A}\), the te...
MCQ+4 / -12024
28Current Electricity
A potential divider circuit is shown in figure. The output voltage V\(_0\) is :
MCQ+4 / -12024
29Current Electricity
Two resistance of \(100 \Omega\) and \(200 \Omega\) are connected in series with a battery of \(4 \mathrm{~V}\) and negligible internal resistance. A voltmeter is used to measure voltage across \(100 \Omega\) resistance, which gives reading...
INTEGER+4 / -12024
30Current Electricity
When a potential difference \(V\) is applied across a wire of resistance \(R\), it dissipates energy at a rate \(W\). If the wire is cut into two halves and these halves are connected mutually parallel across the same supply, the energy dis...
MCQ+4 / -12024
31Current Electricity
The electric current through a wire varies with time as \(I=I_0+\beta t\), where \(I_0=20 \mathrm{~A}\) and \(\beta=3 \mathrm{~A} / \mathrm{s}\). The amount of electric charge crossed through a section of the wire in \(20 \mathrm{~s}\) is :
MCQ+4 / -12024
32Current Electricity
A galvanometer having coil resistance \(10 \Omega\) shows a full scale deflection for a current of \(3 \mathrm{~mA}\). For it to measure a current of \(8 \mathrm{~A}\), the value of the shunt should be:
MCQ+4 / -12024
33Current Electricity
The deflection in moving coil galvanometer falls from 25 divisions to 5 division when a shunt of \(24 \Omega\) is applied. The resistance of galvanometer coil will be :
MCQ+4 / -12024
34Current Electricity
In the given circuit, the current flowing through the resistance \(20 \Omega\) is \(0.3 \mathrm{~A}\), while the ammeter reads \(0.9 \mathrm{~A}\). The value of \(\mathrm{R}_1\) is _________ \(\Omega\).
INTEGER+4 / -12024
35Current Electricity
In the given circuit, the current in resistance R\(_3\) is :
MCQ+4 / -12024
36Current Electricity
A wire of resistance \(\mathrm{R}\) and length \(\mathrm{L}\) is cut into 5 equal parts. If these parts are joined parallely, then resultant resistance will be :
MCQ+4 / -12024
37Current Electricity
A wire of length \(10 \mathrm{~cm}\) and radius \(\sqrt{7} \times 10^{-4} \mathrm{~m}\) connected across the right gap of a meter bridge. When a resistance of \(4.5 \Omega\) is connected on the left gap by using a resistance box, the balanc...
MCQ+4 / -12024
38Current Electricity
Wheatstone bridge principle is used to measure the specific resistance \(\left(S_1\right)\) of given wire, having length \(L\), radius \(r\). If \(X\) is the resistance of wire, then specific resistance is ; $$S_1=X\left(\frac{\pi r^2}{L}\r...
MCQ+4 / -12024
39Current Electricity
A current of \(200 \mu \mathrm{A}\) deflects the coil of a moving coil galvanometer through \(60^{\circ}\). The current to cause deflection through \(\frac{\pi}{10}\) radian is :
MCQ+4 / -12024
40Current Electricity
Three voltmeters, all having different internal resistances are joined as shown in figure. When some potential difference is applied across \(A\) and \(B\), their readings are \(V_1, V_2\) and \(V_3\). Choose the correct option.
MCQ+4 / -12024
41Current Electricity
The current in a conductor is expressed as $I=3 t^2+4 t^3$, where $I$ is in Ampere and $t$ is in second. The amount of electric charge that flows through a section of the conductor during $t=1 \mathrm{~s}$ to $t=2 \mathrm{~s}$ is __________...
INTEGER+4 / -12024
42Current Electricity
A galvanometer has a resistance of $50 ~\Omega$ and it allows maximum current of $5 \mathrm{~mA}$. It can be converted into voltmeter to measure upto $100 \mathrm{~V}$ by connecting in series a resistor of resistance :
MCQ+4 / -12024
43Current Electricity
The reading in the ideal voltmeter $(\mathrm{V})$ shown in the given circuit diagram is :
MCQ+4 / -12024
44Current Electricity
In an ammeter, $5 \%$ of the main current passes through the galvanometer. If resistance of the galvanometer is $\mathrm{G}$, the resistance of ammeter will be :
MCQ+4 / -12024
45Current Electricity
In a metre-bridge when a resistance in the left gap is $2 \Omega$ and unknown resistance in the right gap, the balance length is found to be $40 \mathrm{~cm}$. On shunting the unknown resistance with $2 \Omega$, the balance length changes b...
MCQ+4 / -12024
46Current Electricity
A current of \(2 \mathrm{~A}\) flows through a wire of cross-sectional area \(25.0 \mathrm{~mm}^{2}\). The number of free electrons in a cubic meter are \(2.0 \times 10^{28}\). The drift velocity of the electrons is __________ $$\times 10^{...
INTEGER+4 / -12023
47Current Electricity
The number density of free electrons in copper is nearly \(8 \times 10^{28} \mathrm{~m}^{-3}\). A copper wire has its area of cross section \(=2 \times 10^{-6} \mathrm{~m}^{2}\) and is carrying a current of \(3.2 \mathrm{~A}\). The drift sp...
INTEGER+4 / -12023
48Current Electricity
The equivalent resistance between A and B as shown in figure is:
MCQ+4 / -12023
49Current Electricity
The length of a metallic wire is increased by \(20 \%\) and its area of cross section is reduced by \(4 \%\). The percentage change in resistance of the metallic wire is __________.
INTEGER+4 / -12023
50Current Electricity
As shown in the figure, the voltmeter reads \(2 \mathrm{~V}\) across \(5 ~\Omega\) resistor. The resistance of the voltmeter is _________ \(\Omega\).
INTEGER+4 / -12023