Electric Fields: Interactive Learning Quizzes for Year 12 Physics

Question 1

The typical unit for measuring electric field strength is:

Accepted Answer

Volt per meter.

Answer

Newton per coulomb.

Answer

Joule per coulomb.

Answer

Coulomb per square meter.

Question 2

Inside a conductor, the electric field is:

Accepted Answer

Always zero.

Answer

Proportional to the charge density on the conductor.

Answer

Perpendicular to the surface of the conductor.

Answer

Dependent on the shape of the conductor.

Question 3

Which of the following is a conductor of electricity?

Accepted Answer

Copper

Answer

Rubber

Answer

Glass

Answer

Wood

Question 4

Equipotential surfaces are surfaces where:

Accepted Answer

The electric potential is constant

Answer

The electric field is zero

Answer

The electric field is perpendicular to the surface

Answer

Electrons are accelerated

Question 5

Which of the following can be used to detect the presence of an electric field?

Accepted Answer

Electroscope

Answer

Voltmeter

Answer

Ammeter

Answer

Galvanometer

Question 6

Electric fields are regions of space that:

Accepted Answer

Are influenced by charged objects

Answer

Only exist inside conductors

Answer

Are unaffected by the presence of charges

Answer

Are created by magnetic fields

Question 7

The force between two point charges of opposite signs is:

Accepted Answer

Attractive

Answer

Repulsive

Answer

Zero

Answer

Independent of the distance between the charges

Question 8

The electric field strength at a point due to a point charge is:

Accepted Answer

Directly proportional to the charge and inversely proportional to the square of the distance from the charge

Answer

Inversely proportional to the charge and directly proportional to the distance from the charge

Answer

Independent of the distance and charge

Answer

Dependent on the material between the charge and the point

Question 9

Electric potential is a scalar quantity that:

Accepted Answer

Describes the potential energy of a unit charge at a point

Answer

Describes the electric field strength at a point

Answer

Is the same as electric field

Answer

Is independent of the charge distribution

Question 10

The electric potential at infinity is:

Accepted Answer

Zero by convention

Answer

Positive

Answer

Negative

Answer

Dependent on the charge distribution

Question 11

A Van de Graaff generator is used to:

Accepted Answer

Create high voltages

Answer

Charge objects negatively

Answer

Measure electric fields

Answer

Detect electric currents

Question 12

Which of the following factors does NOT affect the electric field between two charges?

Accepted Answer

Shape of the charges

Answer

Magnitude of the charges

Answer

Distance between the charges

Answer

Medium between the charges

Question 13

Electric potential at a point can be defined as:

Accepted Answer

The work done in moving a unit positive charge from infinity to that point

Answer

The force experienced by a unit positive charge at that point

Answer

The charge density at that point

Answer

The electric field strength at that point

Question 14

Equipotential surfaces are surfaces where:

Accepted Answer

The electric potential remains constant

Answer

The electric field is zero

Answer

The electric field is perpendicular to the surface

Answer

The charge density is maximum

Question 15

The electric field inside a uniformly charged spherical shell is:

Accepted Answer

Zero

Answer

Proportional to the distance from the center

Answer

Inversely proportional to the distance from the center

Answer

Constant throughout the shell

Question 16

An electric dipole consists of:

Accepted Answer

Two opposite charges of equal magnitude separated by a small distance.

Answer

Two like charges of equal magnitude separated by a small distance.

Answer

Three charges of equal magnitude arranged in a triangle.

Answer

Four charges of equal magnitude arranged in a square.

Question 17

The electric potential at a point is defined as:

Accepted Answer

The work done per unit charge to bring a positive charge from infinity to that point.

Answer

The force per unit charge at that point.

Answer

The potential difference between that point and infinity.

Answer

The electric field at that point.

Question 18

Equipotential surfaces are:

Accepted Answer

Surfaces where the electric potential is constant.

Answer

Surfaces where the electric field is strongest.

Answer

Surfaces where the work done in moving a charge around is zero.

Answer

Surfaces where the electric potential is zero.

Question 19

A capacitor is a device that stores:

Accepted Answer

Electric energy.

Answer

Electric charge.

Answer

Electric potential.

Answer

Electric current.

Question 20

The energy stored in a capacitor is given by:

Accepted Answer

1/2CV^2

Answer

CV

Answer

1/2CV

Answer

CV^2

Question 21

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

Accepted Answer

Copper.

Answer

Rubber.

Answer

Plastic.

Answer

Wood.

Question 22

How does the electric field strength of a point charge vary with distance from the charge?

Accepted Answer

Decreases as the square of the distance

Answer

Increases

Answer

Remains constant

Answer

Increases then decreases

Question 23

Which SI unit measures electric charge?

Accepted Answer

Coulomb

Answer

Ampere

Answer

Volt

Answer

Ohm

Question 24

According to Coulomb's Law, the electric force between two point charges is

Accepted Answer

inversely proportional to the square of the distance between them

Answer

directly proportional to the square of the distance between them

Answer

directly proportional to the distance between them

Answer

inversely proportional to the distance between them

Question 25

An electric field is defined as

Accepted Answer

the force per unit charge at a point in space

Answer

the region around a charge where its influence can be detected

Answer

the potential energy per unit charge at a point in space

Answer

the rate of change of electric potential at a point in space

Question 26

The electric potential at a point is

Accepted Answer

the amount of work done to move a unit charge from infinity to that point

Answer

the amount of energy possessed by a unit charge at that point

Answer

the force experienced by a unit charge at that point

Answer

the electric field strength at that point

Question 27

A dipole is formed by

Accepted Answer

two equal and opposite charges separated by a small distance

Answer

two unequal and opposite charges separated by a small distance

Answer

two equal and like charges separated by a small distance

Answer

two unequal and like charges separated by a small distance

Question 28

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

Accepted Answer

Copper

Answer

Rubber

Answer

Plastic

Answer

Wood

Question 29

The electric potential inside a charged parallel plate capacitor is

Accepted Answer

uniform and constant

Answer

non-uniform and increases linearly with distance from the plates

Answer

non-uniform and decreases linearly with distance from the plates

Answer

zero everywhere

Question 30

The capacitance of a parallel plate capacitor is

Accepted Answer

directly proportional to the area of the plates and inversely proportional to the distance between them

Answer

directly proportional to the distance between the plates and inversely proportional to the area of the plates

Answer

independent of the area of the plates and the distance between them

Answer

inversely proportional to the area of the plates and directly proportional to the distance between them

Question 31

What is the unit of electric field strength?

Accepted Answer

Newton per coulomb

Answer

Coulomb

Answer

Volt

Answer

Farad

Question 32

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

Accepted Answer

They can be created by magnetic fields

Answer

They are conservative

Answer

They can exert a force on charged particles

Answer

They obey the superposition principle

Question 33

Define the electric potential at a point.

Accepted Answer

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

Answer

Force experienced by a unit positive charge at that point

Answer

Electric field strength at that point

Answer

Charge density at that point

Question 34

An electron with charge e is placed in an electric field of strength E. The acceleration of the electron is:

Accepted Answer

Proportional to E/m

Answer

Zero

Answer

Proportional to E*m

Answer

Proportional to 1/E

Question 35

The electric field due to a uniformly charged spherical shell of radius R is:

Accepted Answer

Zero inside the shell and proportional to 1/r^2 outside the shell, where r is the distance from the center of the shell

Answer

Proportional to 1/r inside the shell and zero outside the shell

Answer

Proportional to 1/r both inside and outside the shell

Answer

Zero everywhere

Question 36

The potential energy of a system of two point charges, +q and -q, separated by a distance d is:

Accepted Answer

Proportional to q^2/d

Answer

Zero

Answer

Proportional to qd

Answer

Proportional to q/d^2

Question 37

The electric flux through a closed surface surrounding a point charge q is:

Accepted Answer

Proportional to q

Answer

Zero

Answer

Proportional to q/r^2

Answer

Proportional to r/q

Question 38

Two identical point charges are placed a distance d apart. A third identical charge is placed at the midpoint between the first two charges. The force on the third charge is:

Accepted Answer

Zero

Answer

Attractive

Answer

Repulsive

Answer

Proportional to d^2

Question 39

An electric dipole consists of two point charges, +q and -q, separated by a distance d. The electric dipole moment is:

Accepted Answer

Proportional to q*d

Answer

Proportional to q/d

Answer

Proportional to d/q

Answer

Zero

Question 40

Which unit is used to measure electric charge in the SI system?

Accepted Answer

Coulomb

Answer

Ampere

Answer

Volt

Answer

Ohm

Question 41

Which of the following is a good conductor of electricity?

Accepted Answer

Copper

Answer

Plastic

Answer

Glass

Answer

Rubber

Question 42

A capacitor stores electrical energy primarily in the form of:

Accepted Answer

Electric field

Answer

Magnetic field

Answer

Chemical reactions

Answer

Thermal energy

Question 43

What is the relationship between electric field strength (E) and electric potential (V) in a uniform electric field?

Accepted Answer

E = -dV/dx

Answer

E = V/dx

Answer

E = dV/dt

Answer

E = V/dt

Question 44

The fundamental unit of electric charge is the:

Accepted Answer

Coulomb

Answer

Newton

Answer

Joule

Answer

Tesla

Question 45

An electric field is a region of space around a charged particle where:

Accepted Answer

Charged particles experience a force

Answer

Magnetic materials are repelled

Answer

Electrons flow freely

Answer

Electric potential is constant

Question 46

The electric field strength due to a point charge is:

Accepted Answer

Proportional to the inverse square of the distance

Answer

Inversely proportional to the distance

Answer

Independent of the distance

Answer

Zero at all points

Question 47

Electric potential is defined as the:

Accepted Answer

Work done per unit charge in bringing a test charge from infinity to a point

Answer

Force experienced by a unit charge at a point

Answer

Electric field strength at a point

Answer

Change in electric field strength over distance

Question 48

The capacitance of a parallel-plate capacitor is:

Accepted Answer

Proportional to the plate area and inversely proportional to the distance between the plates

Answer

Proportional to the charge stored and inversely proportional to the electric field

Answer

Independent of the plate area and distance between the plates

Answer

Zero for all practical purposes

Question 49

Which of the following is a dielectric material?

Accepted Answer

Rubber

Answer

Copper

Answer

Iron

Answer

Gold

Question 50

The electric field between the plates of a capacitor is:

Accepted Answer

Uniform

Answer

Non-uniform

Answer

Zero

Answer

Proportional to the square of the voltage

Question 51

Which material is a good conductor of electricity?

Accepted Answer

Copper

Answer

Rubber

Answer

Glass

Answer

Wood

Question 52

In which direction does the electric field point due to a negative point charge?

Accepted Answer

Away from the charge

Answer

Towards the charge

Answer

Perpendicular to the charge

Answer

It depends on the distance from the charge

Question 53

Which of the following is not a method to increase the capacitance of a capacitor?

Accepted Answer

Using a material with a lower permittivity

Answer

Increasing the area of the plates

Answer

Decreasing the distance between the plates

Answer

Adding more plates to the capacitor

Question 54

What is the SI unit of electric potential?

Accepted Answer

Volt

Answer

Newton

Answer

Joule

Answer

Coulomb

Question 55

Which of the following is a vector quantity in electrostatics?

Accepted Answer

Electric field

Answer

Electric charge

Answer

Electric potential

Answer

Capacitance

Question 56

Which of these applications utilizes the principles of electrostatics?

Accepted Answer

Capacitors

Answer

Electric motors

Answer

Transistors

Answer

Solar cells

Question 57

How does the polarization of a dielectric material contribute to the formation of an electric field within the material?

Accepted Answer

Polarization induces the formation of bound charges on the surface of the material, generating an electric field.

Answer

By aligning molecular dipoles, polarization reduces the electric field within the material.

Answer

By increasing the permittivity of the material, polarization allows for a stronger electric field within the material.

Answer

Polarization has no direct effect on the formation of an electric field within the material.

Question 58

Which of the following is the SI unit of electric charge?

Accepted Answer

Coulomb (C)

Answer

Ampere (A)

Answer

Farad (F)

Answer

Volt (V)

Question 59

Which of the following equations correctly describes the relationship between electric field strength (E) and electric potential difference (V)?

Accepted Answer

E = -dV/dx

Answer

E = dV/dx

Answer

E = -∇V

Answer

E = ∇V

Question 60

Which of the following materials is known for its ability to conduct electricity effectively?

Accepted Answer

Copper

Answer

Glass

Answer

Rubber

Answer

Plastic

Question 61

Which of the following physical quantities is a vector?

Accepted Answer

Electric field strength

Answer

Electric charge

Answer

Electric potential

Answer

Electric current

Question 62

Which of the following equations represents the dipole moment?

Accepted Answer

pe = qd

Answer

pe = qd/2

Answer

pe = 2qd

Answer

pe = -qd

Question 63

An infinite sheet of charge has a surface charge density denoted by 'σ'. What is the electric field strength due to this charge distribution?

Accepted Answer

σ/ε₀

Answer

σ/2ε₀

Answer

2σ/ε₀

Answer

Zero

Question 64

When a capacitor is filled with a dielectric material of permittivity 'ε', what happens to its capacitance?

Accepted Answer

Capacitance increases

Answer

Capacitance decreases

Answer

Capacitance remains the same

Answer

Capacitance becomes infinite