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JEE • PHYSICS • ELECTRIC FIELDS AND CHARGES

Electric fields and charges practice · Medium

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 1-30 of 385 questions
1 Medium
1 of 385
Understanding +4 | -1
Assertion:- Electric field lines do not cut at any point.
Reason:- At any point, there is only one direction of electric field.
View answer and explanation
Correct option: A
If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion
Option A is correct because electric field lines cannot intersect, as that would imply multiple directions for the electric field at a single point.
2 Medium
2 of 385
Analyzing +4 | -1
Statement-I: A positive point charge is brought in an electric field, the electric field at neary by point will increase

Statement-II: Electric field produced by charge may favour the existing electric filed
View answer and explanation
Correct option: D
Statement-I is false, Statement-II is false
Option C is correct. Bringing a positive charge into an electric field may increase or decrease the field depending on the location, and the electric field produced by the charge can either aid or oppose the existing field.
3 Medium
3 of 385
Understanding +4 | -1
Two particles having equal mass and charge
are separated by a distance r.r. The force(s) they
experience is (are)
View answer and explanation
Correct option: D
Repulsive electromagnetic force and
attractive gravitational force
Option D is correct because particles with equal mass and charge experience both repulsive electromagnetic force and attractive gravitational force.
4 Medium
4 of 385
Understanding +4 | -1
Statement-I: No 2 electric lines of force can intersect each other

Statement-II: tangent at any point of electric line of force gives the direction of electric field
View answer and explanation
Correct option: A
Statement-I is True, statement-II is True
Option A (Statement-I is True, statement-II is True) is correct because both statements are fundamental properties of electric field lines.
5 Medium
5 of 385
Application +4 | -1
A force of 4N4N is acting between two charges in air if the space between them is completely filled with glass (εr=8)\left( {{\varepsilon _r} = 8} \right), then the new force will be …… NN
View answer and explanation
Correct option: B
0.5
Option B (0.5) is correct because the force between two charges decreases by a factor of the relative permittivity when the space between them is filled with a dielectric.
6 Medium
6 of 385
Understanding +4 | -1
An electron is placed at centre of a conducting sphere of radius 0.2 metre having charge 5×10−25 \times {10^{ - 2}} coulomb. The force of on the electron is ________ N
View answer and explanation
Correct option: A
0
Option A (0) is correct because the electric field inside a conductor is always zero, resulting in no force on the electron.
7 Medium
7 of 385
Application +4 | -1
A positive charge particle of 100 mg100 \,\mathrm{mg} is thrown in opposite direction to a uniform electric field of strength 1×105 NC−11 \times 10^5 \,\mathrm{NC}^{-1}. If the charge on the particle is 40μC40 \mu \mathrm{C} and the initial velocity is 200 ms−1200 \mathrm{~ms}^{-1}, how much distance it will travel before coming to the rest momentarily?
View answer and explanation
Correct option: D
0.5 m0.5 \mathrm{~m}
Option D (0.5 m) is correct because it is the distance the charged particle travels before coming to rest, calculated using kinematics and the electric force.
8 Medium
8 of 385
Understanding +4 | -1
A cube of side ll is placed in a uniform field EE, where E=E  i^E = E\;\hat i. The net electric flux through the cube is
View answer and explanation
Correct option: A
Zero
Option A (Zero) is correct because the net electric flux through a closed surface in a uniform electric field is zero, as the incoming and outgoing fluxes cancel each other out.
9 Medium
9 of 385
Understanding +4 | -1
Four dipoles each of magnitudes of charges ±e\pm e are placed inside a sphere. The total flux of E\mathbf{E} coming out of the sphere is
View answer and explanation
Correct option: A
zero
Option A (zero) is correct because the net charge enclosed within the sphere is zero due to the presence of equal and opposite charges in each dipole.
10 Medium
10 of 385
Understanding +4 | -1
Mark the incorrect statement:-
View answer and explanation
Correct option: D
Electric field intensity due to a solid insulating charged sphere, at points inside the sphere
will be zero
Option D is correct because the electric field intensity inside a charged insulating sphere is NOT zero; it increases linearly with distance from the center.
11 Medium
11 of 385
Application +4 | -1
A particle of mass mm and charge qq is in an electric and magnetic field given by E⃗=2i^+3j^;B⃗=4j^+6k^\vec{E}=2 \hat{i}+3 \hat{j} ; \vec{B}=4 \hat{j}+6 \hat{k}. The charged particle is shifted from the origin to the point P(x={P}({x}= 1;y=1)1 ; {y}=1). The magnitude of the total work done by both the fields together (consider all values to be in S.IS.I system) is
View answer and explanation
Correct option: D
5q5 q
Option D (5q5 q) is correct because the work done is only due to the electric field, as the magnetic field does no work on a moving charge.
12 Medium
12 of 385
Application +4 | -1
Three charges each equal to 2μC2 \mu \mathrm{C} are placed at the corners of an equilateral triangle. If force between any two charges is 2F2 F, then the net force on either will be:
View answer and explanation
Correct option: A
23F2 \sqrt{3} F
Option A (23F2 \sqrt{3} F) is correct because the net force is the vector sum of the forces between each pair of charges.
13 Medium
13 of 385
Understanding +4 | -1
Two conducting sphere of radii r1r_1 and r2r_2 are charged to the same surface charge density. The ratio of electric field near their surface is
View answer and explanation
Correct option: D
1:11\mathrm{ }:\mathrm{ }1
Option D is correct. The electric field near the surface of a conductor is proportional to the surface charge density, and since the surface charge density is the same for both spheres, the electric fields are equal.
14 Medium
14 of 385
Understanding +4 | -1
Assertion:- An electrostatic field represent as E⃗=Exi^+Eyj^+Ezk^\vec{E}=E_x \hat{i}+E_y \hat{j}+E_z \widehat{k} satisfies ∇⃗×E⃗=0\vec{\nabla} \times \vec{E}=0
Reason:- Ex,Ey,EzE_x, E_y, E_z are independent of each other.
View answer and explanation
Correct option: A
If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion
Option A (ne{n_e} increases and vd{v_d} decreases) is correct because increasing temperature in a semiconductor increases the number of free electrons but decreases their drift velocity due to increased collisions.
15 Medium
15 of 385
Analyzing +4 | -1
Statement-1: In the frame of reference where all considered charges are rest, the force experienced by a moving test charge due to all considered charges are purely electrical.
Statement-2: A stationary charge produces electric field only.
View answer and explanation
Correct option: A
Statement-1 is true, Statement-2 is true, Statement-2 is the correct explanation for Statement-1
Option A is correct because Statement-1 and Statement-2 are true, and Statement-2 correctly explains why Statement-1 is true. A stationary charge only produces an electric field, and in a frame where all charges are at rest, only electric forces are present.

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16 Medium
16 of 385
Understanding +4 | -1
A charge QQ is enclosed by a Gaussian spherical surface of radius R.R. If the radius is doubled, then the outward electric flux will
View answer and explanation
Correct option: D
Remain the same
Option D is correct because according to Gauss's law, the electric flux depends only on the enclosed charge and not on the radius of the Gaussian surface.
17 Medium
17 of 385
Understanding +4 | -1
An electron is placed at centre of a conducting sphere of radius 0.2 metre having charge 5×10−25 \times {10^{ - 2}} coulomb. The force of on the electron is ________ N
View answer and explanation
Correct option: A
0
Option A (0) is correct because the electric field inside a conductor is always zero, hence the force on the electron is zero.
18 Medium
18 of 385
Application +4 | -1
The electric flex coming out of one face of a cube is 4∈0.\frac{4}{{{ \in _0}}}. The charge placed at the centre of the cube will be
View answer and explanation
Correct option: A
24 C
Option A (24 C) is correct because the total charge enclosed is six times the flux coming out of one face.
19 Medium
19 of 385
Remembering +4 | -1
A current carrying wire in the neighborhood produces
View answer and explanation
Correct option: B
Magnetic field only
Option B (Magnetic field only) is correct because a current-carrying wire produces a magnetic field around it, according to Ampere's law.
20 Medium
20 of 385
Understanding +4 | -1
Under the influence of the Coulomb field of charge +Q,+ Q, a charge −q- q is moving around it in an elliptical orbit. Find out the correct statement(s)
View answer and explanation
Correct option: A
The angular momentum of the charge −q- q is constant
Option A is correct because the angular momentum of the charge is conserved due to the central nature of the Coulomb force.
21 Medium
21 of 385
Understanding +4 | -1
Assertion:- In electrostatics, electric lines of force can never be closed loops.
Reason:- The number of electric lines of force originating from or terminating on a charge is proportional to the magnitude of charge.
View answer and explanation
Correct option: B
If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion
Option B (If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion) is correct. Electric lines of force cannot form closed loops because electrostatic forces are conservative, and the number of lines is proportional to the charge magnitude, but these are independent facts.
22 Medium
22 of 385
Understanding +4 | -1
Assertion: If the medium between two charges is replaced by another medium of greater dielectric constant then the electric force between them decreases.

Reason: Electric dipole moment varies inversely as the dielectric constant.
View answer and explanation
Correct option: C
Assertion is true & Reason is false
Option C is correct because increasing the dielectric constant reduces the electric force, but the electric dipole moment is not inversely proportional to the dielectric constant.
23 Medium
23 of 385
Understanding +4 | -1
For a closed surface through which the net flux is zero, each of the following four statements could be true. Which of the statements must be true ? a) There are no charges inside the surface b) The net charge inside the surface is zero c) The electric field is zero everywhere on the surface d) The number of electric field lines entering the surface equals the number leaving the surface
View answer and explanation
Correct option: B
b, d
Option B (b, d) is correct because zero net flux implies zero net charge inside and equal number of field lines entering and leaving.
24 Medium
24 of 385
Understanding +4 | -1
The electric charges are distributed in a small volume. The flux of the electric field through a spherical surface of radius 10  cm10\mathrm{ }\;cm surrounding the total charge is 20  Vm.20\mathrm{ }\;Vm. The flux over a concentric sphere of radius 20  cm20\;\mathrm{ }cm will be
View answer and explanation
Correct option: A
20  Vm.20\mathrm{ }\;Vm.
Option A is correct. According to Gauss's law, the electric flux through a closed surface depends only on the enclosed charge, not the radius of the sphere.
25 Medium
25 of 385
Analyzing +4 | -1
A positively charged disc is placed on a horizontal plane. A charged particle is released from a certain height on its axis. The particle just reaches the centre of the disc. Select the correct alternative.
View answer and explanation
Correct option: C
Total potential energy of the particle first decreases, then increases
Option C is correct because the total potential energy of the particle first decreases as it approaches the disc due to electrostatic attraction, then increases as it gets closer to the center due to increasing repulsion.
26 Medium
26 of 385
Application +4 | -1
If an electron enters into a space between the plates of a parallel plate capacitor at an angle α\alpha with the plates and leaves at an angle β\beta to the plates. The ratio of its kinetic energy while entering the capacitor to the while leaving will be
View answer and explanation
Correct option: B
(cos⁡βcos⁡α)2\left(\frac{\cos \beta}{\cos \alpha}\right)^2
Option A (15 cm (Concave)) is correct because a concave lens with a focal length of 15 cm is required to correct the person's nearsightedness, allowing them to see objects clearly at 30 cm.
27 Medium
27 of 385
Understanding +4 | -1
Assertion: When a body acquires positive charge, its mass decreases.

Reason: A body acquires positive charge when it loses electrons.
View answer and explanation
Correct option: A
Both Assertion & Reason are true. Reason is the correct explanation for assertion
Option A (Both Assertion & Reason are true. Reason is the correct explanation for assertion) is correct because losing electrons causes a decrease in mass, resulting in a positive charge.
28 Medium
28 of 385
Understanding +4 | -1
Four metal conductors having different shapes 1. A sphere 2. Cylindrical 3. Pear 4. Lightning conductor Are mounted on insulating stands and charged. The one which is best suited to retain the charges for a longer time is
View answer and explanation
Correct option: A
1
Option A (1) is correct because a sphere distributes charge uniformly, minimizing charge concentration and leakage, thus retaining charge longer.
29 Medium
29 of 385
Understanding +4 | -1
Which is bigger - a coulomb or a charge on an electron? How many electronic charges form one coulomb of charge ?
View answer and explanation
Correct option: A
6.25×10186.25 \times 10^{18}
Option A (6.25×10186.25 \times 10^{18}) is correct because one coulomb is a much larger unit of charge than the charge of a single electron, and approximately 6.25×10186.25 \times 10^{18} electrons are required to make up one coulomb.
30 Medium
30 of 385
Understanding +4 | -1
A body has a charge of 9.6×10−209.6 \times {10^{ - 20}} Coulomb. It is
View answer and explanation
Correct option: B
Not possible
Option B is correct because charge is quantized, and 9.6×10−209.6 \times 10^{-20} C is not an integer multiple of the elementary charge (1.6×10−191.6 \times 10^{-19} C).
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Key Takeaways

  • ✓ This set contains 385 single-correct-answer MCQs on ELECTRIC FIELDS AND CHARGES.
  • ✓ Try each question before opening its answer. Read the explanation where one is available.
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