Free Electric Field MCQs with Answers
33 Electric Field MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
An electric field is the force experienced per unit positive test charge, with the field of a point charge given by E = kQ/r² and directed away from positive charges or toward negative charges. Questions involve field lines, superposition and force on a charge, while electric field must be distinguished from electric potential.
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33 questions · page 1 of 2
- A. can cross one another
- B. start on negative charges and end on positive charges
- C. never cross, because the field has only one direction at each point
- D. are always straight
Explanation: Two crossing lines would mean two different field directions at the same point, which is impossible for a single resultant vector.
Correct answer: never cross, because the field has only one direction at each point- A. zero everywhere
- B. maximum at the centre
- C. equal to the field just outside
- D. directed towards the centre
Explanation: Charges on a conductor arrange themselves on the outer surface until the field inside cancels completely; any residual field would move…
Correct answer: zero everywhere- A. uniformly throughout its volume
- B. on its outer surface, concentrating most where the surface is sharply curved
- C. at its centre
- D. only where it was first placed
Explanation: Mutual repulsion drives the charges as far apart as possible, so they collect on the outside, and the surface charge density is highest at…
Correct answer: on its outer surface, concentrating most where the surface is sharply curved- A. a net force but no torque
- B. a torque but no net force
- C. neither force nor torque
- D. both a large net force and a torque
Explanation: The equal and opposite charges feel equal and opposite forces in a uniform field, so the forces cancel, but because they act along…
Correct answer: a torque but no net force- A. - 1.6 x 10^-12 coulomb
- B. - 1.6 x 10^-13 coulomb
- C. - 1.6 × 10 -18 coulomb
- D. - 1.6 × 10 coulomb
Explanation: Each added electron has charge -1.6 x 10^-19 coulomb. For 1,000,000 electrons, total charge = 1,000,000 x (-1.6 x 10^-19 coulomb) = -1.6 x…
Correct answer: - 1.6 x 10^-13 coulomb- A. 100 C m-2
- B. 200 C m-2
- C. 300 C m-2
- D. 400 C m-2
Explanation: The cube side is 5 cm = 0.05 m, and its total surface area is 6a² = 6(0.05 m)² = 0.015 m².
Correct answer: 400 C m-2- A. Field theory
- B. Acoustics
- C. Hydro dynamic
- D. Optics
Explanation: Field theory studies physical fields and their properties, and gravitational physics treats the gravitational field produced by mass.
Correct answer: Field theory- A. E=0,V=0
- B. E=0,V≠ 0
- C. E≠0,V=0
- D. E≠0,V≠0
Explanation: In summary, the correct answer is E=0, V≠0, because at the center of the square, the electric field vectors cancel out due to symmetry…
Correct answer: E=0,V≠ 0- A. Increase
- B. Decrease
- C. Remains constant
- D. Be zero
Explanation: When an insulating slab, also known as a dielectric, is placed between two charges, the force between them will generally decrease.
Correct answer: Decrease- A. N - m / C²
- B. C² N - 1m^-²
- C. C² / (N - m)²
- D. C² / N - m
Explanation: SI unit of permittivity of free space is:C2N−1m−2.
Correct answer: C² N - 1m^-²- A. Never cross each other
- B. Can cross each other
- C. Depends on the shape of charge
- D. Not enough information is available
Explanation: Electric lines of force never intersect each other because at the point of intersection, two tangents can be drawn to the two lines of…
Correct answer: Never cross each other12. Electric Flux through the surface of a sphere which has constant charge at its center depends on:
- A. The radius of the sphere
- B. The surface area of the sphere
- C. The amount of charge inside the sphere
- D. The amount of charge outside the sphere
Explanation: As per Gauss's theorem in electrostatics, the electric flux through a surface depends only on the amount of charge enclosed by the…
Correct answer: The amount of charge inside the sphere- A. electricity.
- B. electrostatic.
- C. electromagnetism.
- D. electromagnetic induction.
Explanation: Ink-jet printers operate by ejecting tiny ink droplets onto paper. Many inkjet printers utilize electrostatic principles to precisely…
Correct answer: electrostatic.- A. electric field.
- B. magnetic field.
- C. electromagnetic field.
Explanation: A) Electric field: A charged particle at rest creates an electric field in the space around it.
Correct answer: electric field.- A. A
- B. B
- C. C
- D. D
Explanation: All arrows are directed inward toward the negative charge. This is the correct representation because electric field lines terminate on…
Correct answer: B- A. Concentrated at the centre of the sphere
- B. Distributed on the inner surface of the sphere
- C. Concentrated inside and outside of the sphere
- D. Distributed on the outer surface of the sphere
Explanation: The correct answer is that the positive charges Q are distributed on the outer surface of the sphere.
Correct answer: Distributed on the outer surface of the sphere17. The total number of electric field lines of forces passing through a unit area is called electric
- A. flux.
- B. field.
- C. intensity.
- D. potential.
Explanation: The correct answer is 'flux.' In electromagnetism, the total number of electric field lines passing through a unit area is referred to as…
Correct answer: flux.- A. electric flux.
- B. magnetic flux.
- C. electric dipole.
- D. magnetic intensity.
Explanation: When positive and negative charges in a conductor are displaced by an electric field, it creates electric flux.
Correct answer: electric flux.- A. area of the surface.
- B. nature of the surface
- C. intensity of the electric field
- D. direction of the surface relative to the electric field
Explanation: The correct answer is Option D: direction of the surface relative to the electric field.
Correct answer: direction of the surface relative to the electric field- A. Zero.
- B. Positive.
- C. Negative.
- D. Undetermined.
Explanation: Gauss's Law states that the net electric flux through a closed surface is equal to the net charge enclosed divided by the permittivity of…
Correct answer: Zero.Electric Field MCQs: common questions
Are these Electric Field MCQs free?
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There are 33 Electric Field MCQs in the Physics bank, shown 20 to a page with the correct answer and an explanation on each.
Does every Electric Field MCQ have an explanation?
Yes. Each Electric Field question shows the correct option and a written explanation of why it is correct, so a wrong answer teaches you something rather than just being marked wrong.
Can I take a timed Electric Field test?
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