JEE Mains Top 500 PYQs

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Top Previous Year Questions - Current Electricity

Question

In the figure shown, the current in the 10 V battery is close to :

    

JEE Main 2020 (06 Sep Shift 2)

Options

  • A: 0.71 A from positive to negative terminal
  • B: 0.42 A from positive to negative terminal 
  • C: 0.21 A from positive to negative terminal
  • D: 0.36 A from negative to postive terminal 
Explaination

Question

The current I1 (in A ) flowing through 1Ω resistor in the following circuit is:

JEE Main 2020 (07 Jan Shift 1)

Options

  • A: 0.4
  • B: 0.5
  • C: 0.2
  • D: 0.25
Explaination

Question

In a meter bridge experiment S is a standard resistance. R is a resistance wire. It is found that balancing length is l=25cm. If R is replaced by a wire of hall length and half diameter that of R of same material, then the balancing distance l' (in cm ) will now be ______________.

JEE Main 2020 (09 Jan Shift 2)

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Explaination

Question

An elliptical loop having resistance R, of semi major axis a , and semi minor axis b  is placed in a magnetic field as shown in the figure. If the loop is rotated about the x-axis with angular frequency ω, the average power loss in the loop due to Joule heating is :

JEE Main 2020 (03 Sep Shift 1)

Options

  • A: π2a2b2B2ω22R
  • B: zero
  • C: πbBωR
  • D: π2a2b2B2ω2R
Explaination

Question

In the experiment of Ohm's law, a potential difference of 5.0 V is applied across the end of a conductor of length 10.0 cm and diameter of 5.00 mm. The measured current in the conductor is 2.00 A. The maximum permissible percentage error in the resistivity of the conductor is :-

JEE Main 2021 (18 Mar Shift 1)

Options

  • A: 3.9
  • B: 8.4
  • C: 7.5
  • D: 3.0
Explaination

Question

A Copper (Cu) rod of length 25 cm and cross-sectional area 3 mm2 is joined with a similar Aluminium (Al) rod as shown in figure. Find the resistance of the combination between the ends A and B.

(Take resistivity of Copper =1.7×10-8 Ωm, Resistivity of aluminium =2.6×10-8 Ωm)

JEE Main 2021 (22 Jul Shift 1)

Options

  • A: 2.170 
  • B: 1.420 
  • C: 0.0858 
  • D: 0.858 
Explaination

Question

Five equal resistances are connected in a network as shown in figure. The net resistance between the points A and B is :

JEE Main 2021 (26 Feb Shift 1)

Options

  • A: R
  • B: R2
  • C: 3R2
  • D: 2R
Explaination

Question

In the given figure, a battery of emf E is connected across a conductor PQ of length l and different area of cross-sections having radii r1 and r2r2<r1.

Choose the correct option as one moves from P to Q.

JEE Main 2021 (27 Jul Shift 1)

Options

  • A: Drift velocity of electron increases.
  • B: Electric field decreases.
  • C: Electron current decreases.
  • D: All of these
Explaination

Question

The equivalent resistance of the given circuit between the terminals A and B is :

JEE Main 2021 (31 Aug Shift 2)

Options

  • A: 0 Ω
  • B: 92 Ω
  • C: 3 Ω
  • D: 1 Ω
Explaination

Question

For the circuit shown, the value of current at time t=3.2 s will be ______ A.

[Voltage distribution V(t) is shown by Fig. (1) and the circuit is shown in Fig. (2)]

JEE Main 2021 (27 Jul Shift 2)

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Explaination

Question

A square-shaped wire with a resistance of each side 3 Ω is bent to form a complete circle. The resistance between two diametrically opposite points of the circle in a unit of Ω will is,  _____.

JEE Main 2021 (31 Aug Shift 1)

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Explaination

Question

An aluminium wire is stretched to make its length, 0.4% larger. The percentage change in resistance is

JEE Main 2022 (26 Jun Shift 1)

Options

  • A: 0.4%
  • B: 0.2%
  • C: 0.8%
  • D: 0.6%
Explaination

Question

Given below are two statements :
Statement I : A uniform wire of resistance 80 Ω is cut into four equal parts. These parts are now connected in parallel. The equivalent resistance of the combination will be 5 Ω.

Statement II : Two resistance 2R and 3R are connected in parallel in an electric circuit. The value of thermal energy developed in 3R and 2R will be in the ratio 3:2.

In the light of the above statements, choose the most appropriate answer from the options given below

JEE Main 2022 (28 Jul Shift 2)

Options

  • A: Both statement I and statement II are correct
  • B: Both statement I and statement II are incorrect
  • C: Statement I is correct but statement II is incorrect
  • D: Statement I is incorrect but statement II is correct.
Explaination

Question

The combination of two identical cells, whether connected in series or parallel combination provides the same current through an external resistance of 2 Ω. The value of internal resistance of each cell is

JEE Main 2022 (29 Jun Shift 2)

Options

  • A: 2 Ω
  • B: 4 Ω
  • C: 6 Ω
  • D: 8 Ω
Explaination

Question

In the given figure, the value of V0 will be _____ V.

JEE Main 2022 (25 Jul Shift 1)

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Explaination

Question

The total current supplied to the circuit as shown in figure by the 5 V battery is _____ A.

JEE Main 2022 (25 Jun Shift 1)

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Explaination

Question

Resistance are connected in a meter bridge circuit as shown in the figure. The balancing length l1 is 40 cm. Now an unknown resistance x is connected in series with P and new balancing length is found to be 80 cm measured from the same end. Then the value of x will be _____ Ω.

JEE Main 2022 (26 Jul Shift 1)

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Explaination

Question

The current density in a cylindrical wire of radius 4 mm is 4×106 A m-2. The current through the outer portion of the wire between radial distances R2 and R is _____ π A.

JEE Main 2022 (27 Jun Shift 1)

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Explaination

Question

A meter bridge setup is shown in the figure. It is used to determine an unknown resistance R using a given resistor of 15 Ω. The galvanometer G shows null defection when tapping key is at 43 cm mark from end A. If the end correction for end A is 2 cm, then the determined value of R will be Ω.

JEE Main 2022 (28 Jun Shift 1)

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Explaination

Question

A student is provided with a variable voltage source V, a test resistor RT=10Ω, two identical galvanometers G1 and G2 and two additional resistors, R1=10MΩ and R2=0.001Ω. For conducting an experiment to verify ohm's law, the most suitable circuit is:

JEE Main 2023 (06 Apr Shift 2)

Options

  • A:

  • B:

  • C:

  • D:

Explaination

Question


The current flowing through R2 is :

JEE Main 2023 (11 Apr Shift 2)

Options

  • A: 23 A
  • B: 12 A
  • C: 13 A
  • D: 14 A
Explaination

Question

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.

JEE Main 2024 (04 Apr Shift 1)

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Explaination

Question

In the experiment to determine the galvanometer resistance by half-deflection method, the plot of $1 / \theta$ vs the resistance $(\mathrm{R})$ of the resistance box is shown in the figure. The figure of merit of the galvanometer is _____ $\times 10^{-1} \mathrm{~A} /$ division. [The source has emf 2V]

JEE Main 2024 (05 Apr Shift 1)

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Explaination

Question

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 $10 \mathrm{~A}$ is $x \times 10^{-2} \Omega$. The value of $x$ is :

JEE Main 2024 (05 Apr Shift 2)

Options

  • A: $2$
  • B: $800$
  • C: $20$
  • D: $200$
Explaination

Question

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 resistance of final combination is _____ $\Omega$.

JEE Main 2024 (05 Apr Shift 2)

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Explaination

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