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Electrostatics JEE Main Questions 2025: Important Practice Questions with PYQs

If you are planning to appear for the JEE Main 2025 exam, then you must go through the Electrostatics important and previous year questions to ensure the best preparations. Check the important Electrostatics JEE Main Questions 2025  in the article.
 

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Electrostatics JEE Main Questions 2025: Candidates who are planning to appear for the JEE Main 2025 are advised to go through the electrostatics chapter as it is one of the most important chapters in the JEE Main physics syllabus 2025 and holds up to 7% of weightage in the exam. Students can expect three to four questions from the chapter Electrostatics. We have developed important questions to practice from the electrostatics for the JEE Mains exam and questions from previous years. Check the complete article below for a detailed explanation. 

Latest update: NTA has declared the JEE Main 2025 exam dates! JEE Main 2025 exam will be conducted between January 22 to 31, 2025.

Check Also: JEE Main Previous Year Question Paper

JEE Main 2025 Electrostatics Important Questions

Candidates can check the important practice questions from Electrostatics for JEE Main 2025 in the table below:

Electrostatics Important Questions for JEE Main 2025

Explanation Important Electrostatics JEE Main Questions 2025

Q1: Two charges, each equal to q, are kept at x = –a and x = a on the x-axis. A particle of mass m and charge q/2 is placed at the origin. If charge q/2 is given a small displacement h (h << a) along the y-axis, the net force acting on the particle is proportional to:

(a) h 

(b) –h 

(c) 1/h 

(d) − 1 /h

Q2: A charged ball B hangs from a silk thread S, which makes an angle θ with a large charged conducting sheet P as shown in the figure. The surface charge density of the sheet is proportional to:

  1. cos θ 
  2. cot θ 
  3. sin θ 
  4. tan θ

Q3:  A and B are two identical spherical charged bodies which repel each other with force F, kept at a finite distance. A third uncharged sphere C of the same size is brought in contact with sphere B and removed. It is then kept at the midpoint of A and B. Find the magnitude of the force on C.

  1. F/2 
  2. F/8 
  3. zero

Q4: Three point charges +q, –2q and +q are placed at points (x = 0, y = a, z = 0), (x = 0, y = 0, z = 0) and (x = a, y = 0, z = 0) respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are

  1. √2 qa along the line joining the points (x = 0, y = 0, z = 0) and (x = a, y = a, z = 0).
  2. √2 qa along the line joining the points (x = 0, y = 0, z = 0) and (x = a, y = a, z = a).
  3. √2 qa along + x direction.
  4. √2 qa along + y direction.

Q5: Two charges q1 and q2 of 0.1 pC and –0.1 pC respectively are 10 Å apart. What is the electric field at a point on the line joining them at a distance of 10 cm from their mid-point?

  1. 18 × 10–10 N C–1 
  2. 10 × 10–10 N C–1
  3. 8 × 10–10 N C–1 
  4. 39 × 10–10 N C–1

Q6: In Millikan’s oil drop experiment, an oil drop carrying a charge Q is held stationary by a potential difference of 2400 V between the plates. To keep a drop of half the radius stationary, the potential difference had to be made 600 V. What is charge on the second drop?

  1. Q/4 
  2. Q/2 
  3. 3Q/2

Q7: The potential difference applied to an X-ray tube is 5 kV and current through it is 3.2 mA. Then the number of electrons striking the target per second is

  1. 1 × 1017 
  2. 2 × 1016
  3. 4 × 1015 
  4. 5 × 106

Q8: The plates of a parallel plate capacitor with air as a distance of 8 mm separate medium. A medium of dielectric constant 2 and thickness 4 mm having the same area is introduced between the plates. For the capacitance to reMain the same, the distance between the plates is

  1. 8 mm 
  2. 5 mm 
  3. 12 mm 
  4. 10 mm

Q9: If capacitance of three identical capacitors in series is 1 μF and later they are connected in parallel. Find the ratio of energy stored in the two configurations, if they are both connected to the same source.

  1. 2 : 5
  2. 1 : 9
  3. 2 : 7
  4. 1: 10

Q10) A parallel plate air capacitor has a capacitance C. When it is half-filled with a dielectric of dielectric constant 5, the percentage increase in the capacitance will be:

  1. 400%
  2. 66.6%
  3. 33.3%
  4. 200%


Also Read: JEE Main Syllabus 2025

Electrostatics Important Topics for JEE Main 2025 

Candidates can check the important topics from the electrostatics chapter for JEE Main 2025 below. 

  • Coulomb’s Law.
  • Electric field and electric lines of force.
  • Electric field due to continuous charge distribution.
  • Electric dipole and dipole moment.
  • Gauss Law.
  • Electric potential and Equipotential surface.
  • Electric potential due to the various charge distributions.
  • Capacitance of a capacitor.
  • Grouping of Capacitance.
Also Read: JEE Main 2025 Eligibility

Electrostatics Weightage in JEE Main 2025 

To understand the importance of Electrostatics in the JEE Main 2025 exam, candidates can check the weightage of the electrostatics chapter in the JEE Main previous year question paper. Check the weightage below in the table:

Year
Total Number of Questions Asked

2024

3

2023

3

2022

3

2021

3

2020

4

2019

1

Also Read: JEE Main Exam Pattern 2025

Electrostatics PYQs JEE Main 2025

Candidates preparing to appear for the JEE Main 2025 exam can check the Electrostatics JEE Main previous year questions below:

Q 1: Force between two point charges q and q placed in a vacuum at 'r' cm apart is F. The force between them when placed in a medium having dielectric constant K=5 at 'r/5' cm apart will be 

  1. 5F
  2. 25F
  3. F/5
  4. F/25       (January 31, 2024, Moring Shift)

Q 2: Two charges q and 3q are separated by a distance 'r' in the air. At a distance x from charge q, the resultant electric field is zero. The value of x is :

  1. r3(1+3)
  2. (1+3)r
  3. r(1+3)
  4. r(1+3)    (January 31, 2024, Moring Shift)

Q 3: Two charged conducting spheres of radii a and b are connected by a conducting wire. The ratio of charges of the two spheres respectively, is:

  1. ab
  2. ba
  3. ab
  4. Ab          (April 8, 2024 Morning Shift)

Q 4: Two identical conducting spheres P and S with charge Q on each, repel each other with a force 16 N. A third identical uncharged conducting sphere R is successively brought in contact with the two spheres. The new force of repulsion between P and S is:

  1. 1 N
  2. 6 N
  3. 12 N
  4. 4 N       (April 6, 2024 Evening Shift)

Q5: Sigma is the uniform surface charge density of a thin spherical shell of radius R. The electric field at any point on the surface of the spherical shell is :

  1. Sigma/E0R
  2. Sigma/E0
  3. Sigma/2E0
  4. Sigma/4E0    (April 6, 2024 Morning Shift)

Q6: The vehicles carrying inflammable fluids usually have metallic chains touching the ground:

  1. To protect tyres from catching dirt from ground
  2. It is a custom
  3. To alert other vehicles
  4. To conduct excess charge due to air friction to ground and prevent sparking                              (April 5, 2024 Evening Shift) 

Q7: In hydrogen like system the ratio of coulombian force and gravitational force between an electron and a proton is in the order of :

  1. 1019
  2. 1039
  3. 1029
  4. 1036 (April 5, 2024 Morning Shift)

Q8: A charge q is placed at the center of one of the surface of a cube. The flux linked with the cube is:

  1. q2ϵ0
  2. Zero
  3. Q4ϵ0
  4. Q8ϵ0 (April 4, 2024 Evenimg Shift)

Q9: ​An infinitely long positively charged straight thread has a linear charge density B cm-1. An electron revolves along a circular path having axis along the length of the wire. The graph that correctly represents the variation of the kinetic energy of electron as a function of radius of circular path from the wire is :

a.

b.

c.

d.

​ ​(April 4, 2024 Morning Shift)

Q10: C1 and C2 are two hollow concentric cubes enclosing charges 2Q and 3Q respectively, as shown in figure. The ratio of electric flux passing through C1 and C2 is :

  1. 3:2
  2. 5:2
  3. 2:5
  4. 2:3 (April 4, 2024 Evening Shift)

Related Reads

We have provided the complete details of the Electrostatics Questions for JEE Main 2025 comprising important questions and previous year questions. We hope that candidates are benefitted from the article. All the best for your JEE Main 2025 exam! Stay tuned to CollegeDekho for the latest updated information regarding JEE mains examination.

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JEE Main Previous Year Question Paper

2024 Physics Paper Morning Shift

Previous Year Question Paper

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