Free Electrostatics MCQs with Answers

• A. Double
• B. Half
• C. Four times
• D. 1/4th

Explanation: Coulomb's law states that the force between two point charges is directly proportional to the product of the magnitudes of charges and…

• A. eV/d
• B. eVd
• C. V/ed
• D. dV/e

Explanation: The electric field E between parallel plates is V/d. The force on a charge q in an electric field E is given by F = qE, so for an electron…

• A. F = kq1q2/d2
• B. F = kq1q2/d
• C. F = kq1q2/d3
• D. F = kq1d/q2

Explanation: The Coulomb force, also known as electrostatic force, is the fundamental force of attraction or repulsion between charged particles.

• A. Charges
• B. System of units and medium
• C. The distance between charges
• D. Nature of medium

Explanation: The value of k in Coulomb's law depends on the system of units and medium.This is because Coulomb's constant, k, takes different numerical…

• A. Current electricity
• B. Electromagnetism
• C. Electrostatics
• D. Nuclear Physics

Explanation: The branch of physics which deals with the charges at rest is electrostatics.

• A. 8.85 x 10^-12 C2/Nm2
• B. 8.85 x 10^-12Nm2/C2
• C. 8.85 x 1 0-12 Cm/N
• D. 8.85 x 10^-12 Nm2/C

Explanation: The permittivity of free space, often denoted by the symbol ε0, is a physical constant that describes the ability of a vacuum to permit…

• A. Decreased
• B. Zero
• C. Increased
• D. None of above

Explanation: When charges are in an insulating medium, such as glass or rubber, their ability to move freely is restricted.

• A. Water
• B. Vacuum
• C. Air
• D. Atmosphere

Explanation: The standard to measure the relative permittivity is vacuum. Relative permittivity, also known as dielectric constant, is a measure of how…

• A. Similar charges attract each other
• B. Similar charges attract and repel
• C. Similar charges repel each other
• D. Similar charges neither attract

Explanation: Opposite charges attract each other, while similar charges repel each other.

• A. A large number of bounded electrons
• B. Small number of electrons
• C. A large number of free electrons
• D. A small number of free electrons

Explanation: Metals are good conductors of electricity because they have a large number of free electrons.

• A. Fixed
• B. Loosely bounded
• C. Strongly fixed
• D. Tightly bounded

Explanation: Free electrons are not fixed in place; they can move relatively freely within a material.

• A. Newton
• B. Coulomb
• C. Pascal
• D. Ampere

Explanation: The SI unit of electric charge is the coulomb which is represented by the symbol 'C'.

• A. Area of surface
• B. Direction of surface
• C. Electric intensity
• D. All of above

Explanation: Since flux depends on all three factors-area, direction, and electric field strength-this is the correct answer.

• A. Storing charge
• B. Storing direct current
• C. Storing alternating current
• D. Storing voltage

Explanation: A capacitor is a device used for storing electric charge by creating an electric field between two conductive plates separated by an…

• A. Flux
• B. Electric intensity
• C. Both (a), (b)
• D. None of these

Explanation: Flux refers to the number of lines of a field (e.g., electric or magnetic) passing perpendicularly through a unit area.

• A. Its path is circular in a plane perpendicular to the plane of magnetic field
• B. The speed and kinetic energy of the particle not remains constant
• C. The velocity and momentum of the particle changes in direction and magnitude
• D. The time period of revolution, angular and frequency of revolution is independent of velocity of the particle and radius of circular path

Explanation: When a charged particle is projected perpendicular to a magnetic field,The path of particle is circular in a plane perpendicular to the…

• A. 0.5 C
• B. 4 C
• C. 0.25 C
• D. 2 C

Explanation: The capacitance is inversely proportional to distance between the plates. Halving the distance would double the capacitance giving us 2C.

• A. Heat energy into chemical energy
• B. Chemical energy into electrical energy
• C. Solar energy into electrical energy
• D. Mechanical energy into electrical energy

Explanation: The correct answer is that the energy supplied by the cell to the charge carriers is derived from the conversion of chemical energy into…

• A. The difference of electric field between the points per unit charge.
• B. The ratio of the power dissipated between the points to the mass of charge.
• C. The work done in moving a test charge between points divided by the magnitude of the test charge.
• D. The force required to move a unit positive charge between the points per unit charge.

Explanation: This question is simply revising how the electric potential is defined as it is work done per unit charge in moving that charge from one…

• A. Electric field lines are towards negative and electron flow in same direction
• B. Electric field lines are towards positive and electron flow in opposite direction
• C. Electric field lines are towards the negative and electrons flow in the opposite direction.
• D. Electric field lines are positive and electrons flow in the same direction.

Explanation: Electric field lines always point away from a positive charge and towards a negative point.