Electric Fields: Interactive Learning Quizzes for Physics Students

Question 1

How does the strength of an electric field relate to the force it exerts on charged particles?

Accepted Answer

Electric field strength is directly proportional to electric force.

Answer

Electric field strength is inversely proportional to electric force.

Answer

Electric field strength is independent of electric force.

Question 2

In the International System of Units (SI), the standard unit of electric charge is the:

Accepted Answer

Coulomb (C)

Answer

Ampere (A)

Answer

Volt (V)

Answer

Ohm (Ω)

Question 3

Gauss's law states that the net electric flux through any closed surface is proportional to:

Accepted Answer

The total charge enclosed by the surface

Answer

The area of the surface

Answer

The volume enclosed by the surface

Answer

The permittivity of the medium inside the surface

Question 4

An electric field is a region of space where:

Accepted Answer

Electric charges experience a force

Answer

Electric potential is constant

Answer

Electric current flows

Answer

Magnetic fields are present

Question 5

The electric field around a point charge Q is:

Accepted Answer

Radial and decreases with distance from the charge

Answer

Uniform in all directions

Answer

Tangential to the surface of a sphere centered on the charge

Answer

Zero everywhere except at the location of the charge

Question 6

Inside a conductor in electrostatic equilibrium, the electric field is:

Accepted Answer

Zero

Answer

Non-zero and uniform

Answer

Non-zero and non-uniform

Answer

Dependent on the shape of the conductor

Question 7

Which of the following materials is a good conductor of electricity?

Accepted Answer

Copper

Answer

Rubber

Answer

Glass

Answer

Wood

Question 8

An electric dipole consists of:

Accepted Answer

Two equal and opposite charges separated by a small distance

Answer

Two equal and like charges separated by a large distance

Answer

A single charge moving in a circular path

Answer

A group of charges arranged randomly

Question 9

Electric potential at a point is defined as the:

Accepted Answer

Work done in bringing a unit positive charge from infinity to that point

Answer

Force experienced by a unit positive charge at that point

Answer

Electric field at that point

Answer

Charge density at that point

Question 10

Equipotential surfaces are surfaces where:

Accepted Answer

Electric potential is constant

Answer

Electric field is zero

Answer

Electric force is maximum

Answer

Electric charge is distributed uniformly

Question 11

How does the presence of a dielectric material affect the electric field strength in a region?

Accepted Answer

Decreases the field strength

Answer

Increases the field strength

Answer

No effect on the field strength

Answer

Reverses the direction of the field

Question 12

According to Coulomb's law, the electric force between two point charges is directly proportional to:

Accepted Answer

The charge of both particles

Answer

The charge of one particle only

Answer

The square of the distance between them

Answer

The cube of the distance between them

Question 13

Gauss's law states that the net electric flux through any closed surface is proportional to:

Accepted Answer

The charge enclosed by the surface

Answer

The area of the surface

Answer

The distance from the surface to the charge

Answer

The potential difference across the surface

Question 14

Which of the following is an appropriate unit for electric field strength?

Accepted Answer

Volt per meter (V/m)

Answer

Newton per coulomb (N/C)

Answer

Coulomb per square meter (C/m²)

Answer

Ampere per meter (A/m)

Question 15

Electric potential at a point in space can be defined as:

Accepted Answer

The work done to move a positive charge from infinity to that point

Answer

The force required to move a negative charge from infinity to that point

Answer

The electric field strength at that point

Answer

The charge at that point

Question 16

An electron moves through a uniform magnetic field. The direction of the magnetic force on the electron is:

Accepted Answer

Perpendicular to the magnetic field

Answer

Parallel to the magnetic field

Answer

Antiparallel to the magnetic field

Answer

In the direction of the electron's velocity

Question 17

Gauss's law finds application in:

Accepted Answer

Determining the charge on a conducting surface

Answer

Calculating the electric field of a point charge

Answer

Finding the potential difference between two points

Answer

Measuring the current flowing in a wire

Question 18

The effect of a dielectric material placed between the plates of a capacitor is to:

Accepted Answer

Increase the capacitance

Answer

Decrease the capacitance

Answer

Leave the capacitance unchanged

Answer

Short-circuit the capacitor

Question 19

Electric fields and electric potential are interconnected concepts. How do they work together to provide insights into electric fields?

Accepted Answer

Electric fields are generated by electric potential, and the gradient theorem allows us to determine electric potential from electric fields.

Answer

Electric fields and electric potential are independent concepts and cannot be combined to analyze electric fields.

Answer

Electric potential generates electric fields, but electric fields cannot generate electric potential.

Answer

Electric fields and electric potential are essentially the same concept, just expressed in different units.

Question 20

In which situation are Coulomb's law and Gauss's law not applicable for determining electric fields?

Accepted Answer

Finding the electric field inside a cavity within a conductor

Answer

Calculating the electric field of a uniformly charged sphere

Answer

Determining the electric field produced by a point charge

Answer

Calculating the electric field of a continuous charge distribution with a complex shape

Question 21

Coulomb's law describes the force between:

Accepted Answer

Point charges

Answer

Dipoles

Answer

Neutral objects

Answer

Large charged objects

Question 22

Gauss's law relates electric flux through a closed surface to the:

Accepted Answer

Enclosed electric charge

Answer

Electric field strength

Answer

Magnetic field strength

Answer

Current density

Question 23

An electric dipole is made up of:

Accepted Answer

Two equal and opposite charges separated by a finite distance

Answer

A single positive charge

Answer

Two equal charges separated by an infinite distance

Question 24

Which factors influence the strength of an electric field?

Accepted Answer

Magnitude and sign of charges, distance between charges

Answer

Velocity of charges, air resistance

Answer

Shape of charges, temperature

Question 25

Which property describes electric field lines?

Accepted Answer

They originate from positive charges and terminate on negative charges

Answer

They are always straight lines

Answer

They intersect at right angles

Question 26

The electric field inside a conductor is:

Accepted Answer

Zero

Answer

Equal to the electric field outside the conductor

Answer

Opposite in direction to the electric field outside the conductor

Answer

Proportional to the conductivity of the material

Question 27

Electric potential at a point is defined as:

Accepted Answer

The work done per unit charge in bringing a test charge from infinity to that point

Answer

The energy stored per unit charge at that point

Answer

The force per unit charge at that point

Question 28

Which unit is used to measure electric potential?

Accepted Answer

Volt

Answer

Newton

Answer

Joule

Answer

Coulomb

Question 29

A uniform electric field of strength 500 N/C is applied to a region of space. What is the force experienced by an electron (charge -1.6 × 10⁻¹⁹ C) in this field?

Accepted Answer

8 × 10⁻¹⁹ N

Answer

1 × 10⁻¹⁹ N

Answer

4 × 10⁻¹⁹ N

Answer

2 × 10⁻¹⁹ N

Question 30

What is the electric field strength inside a conductor?

Accepted Answer

Zero

Answer

Proportional to the charge density on the conductor

Answer

Equal to the electric field strength just outside the conductor

Answer

Dependent on the shape of the conductor

Question 31

Which of the following materials is a poor conductor of electricity?

Accepted Answer

Rubber

Answer

Copper

Answer

Gold

Answer

Silver

Question 32

What is the SI unit of electric potential?

Accepted Answer

Volt

Answer

Tesla

Answer

Coulomb

Answer

Joule

Question 33

Two charges of equal magnitude but opposite sign are separated by a distance of 2 meters. What is the electric potential at a point midway between them?

Accepted Answer

Zero

Answer

Negative

Answer

Dependent on the magnitude of the charges

Answer

Positive

Question 34

What is Gauss's law?

Accepted Answer

The total electric flux through a closed surface is equal to the enclosed charge divided by the permittivity of the medium.

Answer

The potential difference between two points is equal to the work done in moving a charge between the points.

Answer

The electric field intensity is inversely proportional to the square of the distance from the charge.

Question 35

What is the electric field intensity within a spherical conductor?

Accepted Answer

Zero

Answer

Constant

Answer

Proportional to the distance from the center

Answer

Inversely proportional to the distance from the center

Question 36

What is the direction of the electric field due to a positive point charge?

Accepted Answer

Away from the charge

Answer

Parallel to the charge

Answer

Towards the charge

Answer

Perpendicular to the charge

Question 37

According to Coulomb's Law, the relationship between the electric field strength (E) and the distance (r) from a point charge is:

Accepted Answer

Inverse square law: E ∝ 1/r^2

Answer

Linear law: E ∝ r

Answer

Inverse cube law: E ∝ 1/r^3

Answer

Exponential law: E ∝ e^(-r)

Question 38

Which of the following is NOT a property of electric fields?

Accepted Answer

They can exist independently of charges

Answer

They obey the superposition principle

Answer

They are conservative

Question 39

A closed surface encloses a total charge of +3 nC. What is the net electric flux through the surface?

Accepted Answer

+3 × 10^9 Nm^2/C

Answer

0 Nm^2/C

Answer

-3 × 10^9 Nm^2/C

Answer

+6 × 10^9 Nm^2/C

Question 40

Which of the following materials is a good conductor of electricity?

Accepted Answer

Copper

Answer

Wood

Answer

Glass

Answer

Rubber

Question 41

Identify the unit of measurement for electric field strength:

Accepted Answer

Newtons per coulomb (N/C)

Answer

Tesla (T)

Answer

Ampere (A)

Answer

Watts per meter (W/m)

Question 42

According to Coulomb's law, the electric force between two point charges is directly proportional to:

Accepted Answer

The magnitude of the charges multiplied together

Answer

The distance between the charges

Answer

The square root of the distance between the charges

Answer

The sum of the charges

Question 43

Gauss's law states that the total electric flux through a closed surface is proportional to:

Accepted Answer

The total electric charge enclosed by the surface

Answer

The potential difference between the surface and infinity

Answer

The surface area of the surface

Answer

The permittivity of the medium

Question 44

Calculate the magnitude of the electric force between an electron and a proton separated by a distance of 1 nm:

Accepted Answer

2.304 x 10^-28 N

Answer

1.152 x 10^-28 N

Answer

4.608 x 10^-28 N

Answer

9.216 x 10^-28 N

Question 45

A capacitor with a capacitance of 10 μF is charged to a potential difference of 100 V. Calculate the energy stored in the capacitor:

Accepted Answer

5 mJ

Answer

40 mJ

Answer

20 mJ

Answer

10 mJ

Question 46

Which material is a good conductor of electricity?

Accepted Answer

Copper

Answer

Rubber

Answer

Glass

Answer

Wood

Question 47

An electric field is a region of space surrounding a charged object where:

Accepted Answer

Other charged objects experience a force.

Answer

Magnetic forces are present.

Answer

Electrical energy is stored.

Answer

Current flows.

Question 48

Gauss's Law states that the total electric flux through a closed surface is directly proportional to:

Accepted Answer

The total charge enclosed by the surface.

Answer

The electric field strength at the surface.

Answer

The surface area of the surface.

Answer

The voltage at the surface.

Question 49

The direction of an electric field line is:

Accepted Answer

Away from positive charges and towards negative charges.

Answer

Perpendicular to the direction of charge movement.

Answer

Towards positive charges and away from negative charges.

Question 50

The electric field strength at a point is defined as:

Accepted Answer

The force exerted on a unit positive charge placed at that point.

Answer

The amount of charge present at that point.

Answer

The voltage gradient at that point.

Question 51

A dipole consists of:

Accepted Answer

Two equal and opposite charges separated by a distance.

Answer

A single positive charge.

Answer

A single negative charge.

Question 52

The potential difference between two points in an electric field is:

Accepted Answer

The work done per unit charge in moving a charge between the points.

Answer

The force exerted on a charge at the points.

Answer

The charge present at the points.

Question 53

Equipotential surfaces are surfaces where:

Accepted Answer

The electric potential is constant.

Answer

The electric potential is at a maximum.

Answer

The electric potential is zero.

Answer

The electric potential is at a minimum.

Question 54

The capacitance of a parallel-plate capacitor is directly proportional to:

Accepted Answer

The area of the plates.

Answer

The voltage applied to the plates.

Answer

The charge stored on the plates.

Answer

The distance between the plates.