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JEE • PHYSICS • ELECTRIC FIELDS AND CHARGES

Electric fields and charges practice · Easy

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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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1 Easy

1 of 25

Analyzing +4 | -1

Statement-1: If equal charge is put uniformly on a surface of two identical plates one of metal and other non-metal, then electric field in front of metal plate will be more.
Statement-2: Electric field in front of non-metal sheet is

\frac{\sigma}{2 \varepsilon_0}

where

\sigma

is the surface charge density.

View answer and explanation

Correct option: D

Statement-1 is false, Statement-2 is true

Option D is correct because the electric field in front of a metal plate is

\frac{σ}{ε_0}

, while the electric field in front of a non-metal sheet is

\frac{σ}{2ε_0}

. Therefore, Statement-1 is false, and Statement-2 is true.

2 Easy

2 of 25

Remembering +4 | -1

The dielectric constant K of an insulator can be:

View answer and explanation

Correct option: A

Option A (5) is correct because the dielectric constant (K) of an insulator is always greater than 1, and 5 is the only option that satisfies this condition.

3 Easy

3 of 25

Remembering +4 | -1

Electric lines of forces are

View answer and explanation

Correct option: A

Open curves

Option A (Open curves) is correct because electric field lines originate from positive charges and terminate at negative charges, or extend to infinity, thus forming open curves.

4 Easy

4 of 25

Remembering +4 | -1

The dielectric constant K of an insulator cannot be:

View answer and explanation

Correct option: B

\infty

Option B (

\infty

) is correct because the dielectric constant of a conductor is infinite, and an insulator cannot have the properties of a conductor.

5 Easy

5 of 25

Understanding +4 | -1

Statement-1: Any net charge of a conductor resides on its outer surface.
Statement-2: The electrostatic energy of a conductor is minimum when charge is spread over the surface.

View answer and explanation

Correct option: B

Statement-1 is true, Statement-2 is true, Statement-2 is not the correct explanation for Statement-1

Option B (Statement-1 is true, Statement-2 is true, Statement-2 is not the correct explanation for Statement-1) is correct because both statements are factually correct, but the minimum energy is not the direct cause of charge residing on the surface.

6 Easy

6 of 25

Analyzing +4 | -1

Assertion: A charge particle is released from rest in magnetic field then it will move in circular path.
Reason: Work done by magnetic field is non zero.

View answer and explanation

Correct option: D

If both assertion and reason are false

Option D is correct because a charged particle released from rest in a magnetic field will not move in a circular path (it will remain at rest), and the work done by a magnetic field is always zero.

7 Easy

7 of 25

Analyzing +4 | -1

Assertion:- For a charged shell, potential inside shell depends only on the field inside shell.
Reason:- Potential of shell may be determined only by the field outside.

View answer and explanation

Correct option: D

If both Assertion & Reason are False

Option D is correct because the potential inside a charged shell is constant and depends on the charge on the shell, not just the field inside, and the potential of the shell depends on the charge distribution both inside and outside.

8 Easy

8 of 25

Remembering +4 | -1

Electric lines of force:

View answer and explanation

Correct option: A

are imaginary

Option A (are imaginary) is correct because electric lines of force are a visual representation of the electric field, not a physical entity.

9 Easy

9 of 25

Analyzing +4 | -1

Assertion: In a region, where uniform electric field exists, the net charge within volume of any size is zero.

Reason: The electric flux within any closed surface in region of uniform electric field is zero.

View answer and explanation

Correct option: A

If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

Option A is correct. In a uniform electric field, the net charge within any volume is zero because the electric flux through any closed surface is zero, implying no net enclosed charge according to Gauss's law.

10 Easy

10 of 25

Analyzing +4 | -1

Assertion (A): Using Gauss law, it is possible to find the electric field at any point.
Reason (R): Gauss law is applicable for any type of charge distribution.

View answer and explanation

Correct option: C

A is true but R is false

Option C (A is true but R is false) is correct because Gauss's law can be used to find the electric field at any point, but it's only practical for charge distributions with sufficient symmetry.

11 Easy

11 of 25

Understanding +4 | -1

A sphere of radius 1 m encloses a charge of

5\mu C.

Another charge of

-5 \mu C

is placed inside the sphere.
The net electric flux would be

View answer and explanation

Correct option: C

Zero

Option C is correct because according to Gauss's law, the net electric flux through a closed surface depends only on the net charge enclosed. Since the total charge inside the sphere is zero (+5μC - 5μC = 0), the net electric flux is zero.

12 Easy

12 of 25

Understanding +4 | -1

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Work done by electric field on moving a positive charge on an equipotential surface is always zero.

Reason (R): Electric lines of forces are always perpendicular to equipotential surfaces.

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

View answer and explanation

Correct option: C

Both (A) and (R) are correct and (R) is the correct explanation of (A)

Option C (Both (A) and (R) are correct and (R) is the correct explanation of (A)) is correct because work done is zero on an equipotential surface, and electric field lines are perpendicular to equipotential surfaces.

13 Easy

13 of 25

Remembering +4 | -1

The phenomenon used in the designing of T.V. cables is

View answer and explanation

Correct option: C

Electrostatic shielding.

Option C (Electrostatic shielding) is correct because TV cables use electrostatic shielding to protect the signal from external electromagnetic interference, ensuring signal clarity.

14 Easy

14 of 25

Analyzing +4 | -1

Given below are two statements:
Statement I: The electric force changes the speed of the charged particle and hence changes its kinetic energy; whereas the magnetic force does not change the kinetic energy of the charged particle.
Statement II: The electric force accelerates the positively charged particle perpendicular to the direction of electric field. The magnetic force accelerates the moving charged particle along the direction of magnetic field.
In the light of the above statements, choose the most appropriate answer from the options given below:

View answer and explanation

Correct option: C

Statement I is correct but statement II is incorrect

The correct answer is C because statement I is correct, but statement II is incorrect. Electric force changes kinetic energy, but magnetic force doesn't. Magnetic force accelerates perpendicular, not along the field.

15 Easy

15 of 25

Understanding +4 | -1

A charge

q

is placed on a solid metallic object of irregular shape. Charge

q

will distribute itself.

View answer and explanation

Correct option: D

Non uniformly on the surface of metal

Option D (Non uniformly on the surface of metal) is correct because the charge distribution on an irregular metallic object depends on the curvature of the surface.

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16 Easy

16 of 25

Remembering +4 | -1

Gauss’s law of electricity is given by

View answer and explanation

Correct option: A

\int \mathrm{E} \cdot \mathrm{dA}=\frac{\mathrm{Q}}{\varepsilon_0}

Option A (

\int \mathrm{E} \cdot \mathrm{dA}=\frac{\mathrm{Q}}{\varepsilon_0}

) is correct because it represents Gauss's law, relating the electric flux through a closed surface to the enclosed charge.

17 Easy

17 of 25

Understanding +4 | -1

During thunderstorm, it is advised to

View answer and explanation

Correct option: A

Be inside a car or a bus and close the windows.

Option A is correct because a car or bus acts as a Faraday cage, providing electrostatic shielding during a thunderstorm.

18 Easy

18 of 25

Analyzing +4 | -1

A tennis ball which has been covered with charges is suspended by a thread so that it hangs between two metal plates. One plate is earthed, while other is attracted to a high voltage generator. The ball

View answer and explanation

Correct option: A

swings backward & forward hitting each plate in turn

Option A is correct because the charged ball will be attracted to the high voltage plate, then repelled after contact, and attracted to the earthed plate, then repelled, causing it to swing back and forth.

19 Easy

19 of 25

Remembering +4 | -1

The electrostatic force

\left(\overrightarrow{\mathrm{F}}_1\right)

and magnetic force

\left(\overrightarrow{\mathrm{F}}_2\right)

acting on a charge

\mathrm{q}

moving with velocity

\mathrm{v}

can be written:

View answer and explanation

Correct option: C

\overrightarrow{\mathrm{F}}_1=\mathrm{q} \overrightarrow{\mathrm{E}}, \overrightarrow{\mathrm{F}}_2=\mathrm{q}(\overrightarrow{\mathrm{V}} \times \overrightarrow{\mathrm{B}})

Option C (

\overrightarrow{\mathrm{F}}_1=\mathrm{q} \overrightarrow{\mathrm{E}}, \overrightarrow{\mathrm{F}}_2=\mathrm{q}(\overrightarrow{\mathrm{V}} \times \overrightarrow{\mathrm{B}})

) is correct because the electrostatic force is given by

qE

and the magnetic force by

q(v \times B)

20 Easy

20 of 25

Understanding +4 | -1

Assertion (A): Some charge is put at the centre of a conducting sphere. It will move to the surface of the sphere.

Reason (R): Conducting sphere has no free electrons at the centre.

View answer and explanation

Correct option: A

Both A and R are true and R is the correct
explanation of A

Option A is correct because charges in a conductor redistribute to the surface, and the absence of free electrons at the center facilitates this movement.

21 Easy

21 of 25

Understanding +4 | -1

A neutral body is charged positively by rubbing it, its weight

View answer and explanation

Correct option: B

Decreases slightly

Option B (Decreases slightly) is correct because when a neutral body is charged positively, it loses electrons, thus reducing its mass and weight slightly.

22 Easy

22 of 25

Understanding +4 | -1

Two conducting spheres of radii

r_1

and

r_2

are charged to equal surface charge density. The ratio of electric fields just outside the surface is:

View answer and explanation

Correct option: D

1: 1

Option D (

1: 1

) is correct because the electric field just outside a charged conductor depends only on the surface charge density and the permittivity of free space, and since the surface charge densities are equal, the electric fields are equal.

23 Easy

23 of 25

Application +4 | -1

Two charges of

5 Q

and

-2 Q

are situated at the points

(3 a, 0)

and

(-5 a, 0)

respectively. The electric flux through a sphere of radius '

4 a

' having center at origin is

View answer and explanation

Correct option: D

\frac{5 Q}{\varepsilon_0}

Option D (

\frac{5 Q}{\varepsilon_0}

) is correct because it applies Gauss's law to find the electric flux through the sphere, considering only the charge enclosed within the sphere.

24 Easy

24 of 25

Remembering +4 | -1

There are two kinds of charges-positive charge and negative charge. The property which differentiates the two kinds of charges is called

View answer and explanation

Correct option: D

polarity of charge

Option D (polarity of charge) is correct because the property that distinguishes positive and negative charges is their polarity.

25 Easy

25 of 25

Analyzing +4 | -1

Statement-1: An electric dipole placed in the electric field of a point charge can never experience zero resultant force.
Statement-2: Electric field of a point charge is non uniform.

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 (Statement-1 is true, Statement-2 is true, Statement-2 is the correct explanation for Statement-1) is correct because the electric field of a point charge is non-uniform, causing a net force on the dipole.

Revision notes and key takeaways

Review ELECTRIC FIELDS AND CHARGES in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 25 single-correct-answer MCQs on ELECTRIC FIELDS AND CHARGES.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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