Electric Fields: Interactive Learning Quizzes for Sixth Form Physics

Question 1

Which of the following is a unit of electric field?

Accepted Answer

Newton per meter

Answer

Volt

Answer

Coulomb

Answer

Farad

Question 2

What is an electric field, and what are three of its key characteristics?

Accepted Answer

An electric field is a region of space where a charged particle experiences a force.

Accepted Answer

The direction of an electric field points away from positive charges and towards negative charges.

Answer

The strength of an electric field is directly proportional to the distance from the charged particle.

Answer

Electric fields only exist in the presence of magnetic fields.

Question 3

What is the unit of electric field strength in the International System of Units (SI)?

Accepted Answer

Newton per coulomb (N/C)

Answer

Coulomb (C)

Answer

Volt (V)

Answer

Farad (F)

Question 4

The energy stored in a capacitor is:

Accepted Answer

Proportional to the product of its capacitance and the voltage across it

Answer

Directly proportional to its capacitance

Answer

Directly proportional to the square of the voltage across it

Answer

Directly proportional to the square of the current flowing through it

Question 5

Electric fields are utilized in various applications. Which of the following is NOT an example of such an application?

Accepted Answer

Magnetic resonance imaging (MRI)

Answer

Photocopying

Answer

Electroplating

Answer

Electric motors

Question 6

Which of the following is the SI unit of electric field strength?

Accepted Answer

Volt per meter

Answer

Coulomb

Answer

Newton

Answer

Ampere

Question 7

Coulomb's law states that the force between two point charges is directly proportional to:

Accepted Answer

the product of the charges

Answer

the distance between the charges

Answer

the square of the charges

Answer

the sum of the charges

Question 8

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

Accepted Answer

They are always uniform in strength

Answer

They are conservative

Answer

They can be represented by field lines

Answer

They exert forces on charged particles

Question 9

A dipole consists of:

Accepted Answer

Two opposite charges separated by a distance

Answer

Two equal positive charges separated by a distance

Answer

Two equal negative charges separated by a distance

Answer

Two like charges separated by a distance

Question 10

The electric field strength at a point on the surface of a charged sphere is:

Accepted Answer

Proportional to the charge on the sphere

Answer

Zero

Answer

Proportional to the radius of the sphere

Answer

Proportional to the square of the radius of the sphere

Question 11

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

Accepted Answer

The charge enclosed by the surface

Answer

The area of the surface

Answer

The shape of the surface

Answer

The permittivity of the medium

Question 12

The electric field inside a charged conducting sphere is:

Accepted Answer

Zero

Answer

Uniform and directed radially outward

Answer

Uniform and directed radially inward

Answer

Non-uniform and varies with the distance from the center

Question 13

Consider two charges of equal magnitude but opposite sign placed a certain distance apart. The electric field intensity at a point midway between the charges is:

Accepted Answer

Zero

Answer

Equal to the field due to one charge

Answer

Equal to twice the field due to one charge

Answer

Dependent on the distance between the charges

Question 14

A dielectric material has a permittivity that is:

Accepted Answer

Greater than the permittivity of vacuum

Answer

Less than the permittivity of vacuum

Answer

Equal to the permittivity of vacuum

Answer

Negative

Question 15

The electric field intensity inside a parallel plate capacitor is:

Accepted Answer

Uniform and directed from the positive plate to the negative plate

Answer

Zero

Answer

Uniform and directed from the negative plate to the positive plate

Answer

Non-uniform and varies with the distance between the plates

Question 16

The capacitance of a capacitor increases if:

Accepted Answer

The permittivity of the dielectric between the plates is increased

Answer

The distance between the plates is increased

Answer

The area of the plates is decreased

Answer

The voltage across the capacitor is increased

Question 17

The SI unit of electric field intensity is:

Accepted Answer

Volt per meter (V/m)

Answer

Newton (N)

Answer

Coulomb (C)

Answer

Farad (F)

Question 18

Coulomb's law describes the electrostatic force between two point charges. Which equation represents Coulomb's law?

Accepted Answer

F = kq_1q_2 / r^2

Answer

F = GmM / r^2

Answer

F = mg

Answer

F = ma

Question 19

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

Accepted Answer

Electric fields are always directed towards positive charges.

Answer

Electric fields are conservative.

Answer

Electric fields can be shielded by conductors.

Answer

Electric fields obey the superposition principle.

Question 20

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

Accepted Answer

Copper

Answer

Plastic

Answer

Glass

Answer

Rubber

Question 21

The strength of the electric field due to a point charge is directly proportional to:

Accepted Answer

The square of the charge and the inverse square of the distance

Answer

The charge only

Answer

The square of the charge

Answer

The charge and the distance

Question 22

A capacitor is a device that:

Accepted Answer

Stores electrical energy

Answer

Increases the current in a circuit

Answer

Reduces the voltage in a circuit

Answer

Converts AC to DC

Question 23

A dielectric material placed between the plates of a capacitor:

Accepted Answer

Increases the capacitance

Answer

Decreases the capacitance

Answer

Has no effect on the capacitance

Answer

Reverses the polarity of the capacitor

Question 24

The electric field lines associated with a point charge are:

Accepted Answer

Radial and point away from the charge

Answer

Radial and point towards the charge

Answer

Circular and concentric with the charge

Answer

Elliptical

Question 25

How does the electric field strength (E) of a point charge (q) in a vacuum change as the distance (r) from the charge increases?

Accepted Answer

E decreases proportionally to 1/r

Answer

E increases proportionally to r

Answer

E remains constant

Answer

E increases proportionally to r²

Question 26

Which of the following is the formula for Coulomb's law?

Accepted Answer

F = k * q1 * q2 / r^2

Answer

F = k * q1 * q2 / r

Answer

F = k * q1 / q2 * r^2

Answer

F = k * r / q1 * q2

Question 27

What is the expression for the electric field intensity at a point due to a point charge?

Accepted Answer

E = k * q / r^2

Answer

E = k * q / r

Answer

E = k * r / q

Answer

E = k * q^2 / r

Question 28

What is the SI unit of electric field intensity?

Accepted Answer

Volt per meter

Answer

Coulomb

Answer

Newton per coulomb

Answer

Ampere

Question 29

What is the electric potential at a point due to a point charge?

Accepted Answer

V = k * q / r

Answer

V = k * q * r

Answer

V = k * r / q

Answer

V = k * q^2 / r

Question 30

Two point charges, q1 and q2, are separated by a distance r. The electric field due to q1 at the location of q2 is E1. What is the electric field due to q2 at the location of q1?

Accepted Answer

E1

Answer

2E1

Answer

E1/2

Answer

E1/4

Question 31

An electron is moving with a constant velocity parallel to a uniform electric field. What is the work done by the electric field on the electron?

Accepted Answer

Zero

Answer

Dependent on the direction of the electric field

Answer

Positive

Answer

Negative

Question 32

A dielectric material with a dielectric constant greater than 1 is inserted between the plates of a capacitor. What happens to the capacitance of the capacitor?

Accepted Answer

It increases.

Answer

It becomes zero.

Answer

It decreases.

Answer

It remains the same.

Question 33

What is the electric field strength inside a hollow charged conductor?

Accepted Answer

Zero

Answer

Proportional to the charge on the conductor.

Answer

Equal to the electric field strength outside the conductor.

Question 34

A conducting sphere is placed in a uniform electric field. What is the charge distribution on the surface of the sphere?

Accepted Answer

The charge is uniformly distributed.

Answer

The charge is concentrated at the equator.

Answer

The charge is randomly distributed.

Answer

The charge is concentrated at the poles.

Question 35

Which of the following statements about electric fields is false?

Accepted Answer

They have a constant direction but no magnitude.

Answer

They can exert forces on other charges.

Answer

They are vectors with both direction and magnitude.

Answer

They exist around charged objects.

Question 36

Coulomb's law describes the relationship between:

Accepted Answer

The electric force between two point charges.

Answer

The capacitance of a capacitor.

Answer

The potential energy of a charge in an electric field.

Answer

The electric field around a single charge.

Question 37

Inside a charged conducting sphere, the electric field is:

Accepted Answer

Zero.

Answer

Directed away from the center.

Answer

Directed towards the center.

Question 38

Which material is the best electrical conductor?

Accepted Answer

Copper

Answer

Wood

Answer

Rubber

Answer

Glass

Question 39

The equipotential surfaces surrounding a point charge are:

Accepted Answer

Spherical.

Answer

Cylindrical.

Answer

Elliptical.

Answer

Planar.

Question 40

Which factor does NOT affect the strength of an electric field?

Accepted Answer

Mass of the charges

Answer

Permittivity of the medium

Answer

Magnitude of the charges

Answer

Distance between the charges

Question 41

The electric field strength at a distance of 2 cm from a point charge of 10 μC is approximately:

Accepted Answer

9 × 10^6 N/C

Answer

9 × 10^4 N/C

Answer

9 × 10^8 N/C

Answer

9 × 10^2 N/C

Question 42

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

Accepted Answer

They are scalar quantities.

Answer

They obey the principle of superposition.

Answer

They can exert forces on charged objects.

Answer

Their strength is directly proportional to the charge creating them.

Question 43

A positive point charge is placed at the origin of a coordinate system. The electric field at a point (3, 4, 0) is:

Accepted Answer

(2.4 × 10^9 N/C) î + (3.2 × 10^9 N/C) ĵ

Answer

(2.4 × 10^9 N/C) î - (3.2 × 10^9 N/C) ĵ

Answer

(-2.4 × 10^9 N/C) î - (3.2 × 10^9 N/C) ĵ

Answer

(-2.4 × 10^9 N/C) î + (3.2 × 10^9 N/C) ĵ

Question 44

Which of the following shapes will produce a uniform electric field inside its cavity?

Accepted Answer

Spherical shell

Answer

Cuboid

Answer

Cone

Answer

Cylinder

Question 45

The electric field between the plates of a parallel plate capacitor is:

Accepted Answer

Uniform and directed from the positive to the negative plate.

Answer

Radial and directed from the center of the capacitor to the plates.

Answer

Non-uniform and directed from the negative to the positive plate.

Question 46

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

Accepted Answer

Copper

Answer

Glass

Answer

Rubber

Answer

Wood

Question 47

The presence of a dielectric material within an electric field causes the field strength to:

Accepted Answer

Decrease compared to the field strength in a vacuum.

Answer

Increase compared to the field strength in a vacuum.

Answer

Remain unchanged.

Question 48

Which of the following devices primarily stores electrical energy in an electric field?

Accepted Answer

Capacitor

Answer

Inductor

Answer

Battery

Answer

Resistor

Question 49

The electric field lines around a positively charged sphere are:

Accepted Answer

Directed radially outward from the center of the sphere.

Answer

Random and non-uniform.

Answer

Directed radially inward towards the center of the sphere.

Answer

Circular and parallel to the surface of the sphere.

Question 50

Two point charges, +Q and -Q, are placed a distance 'd' apart. At what point along the line connecting the two charges is the electric field zero?

Accepted Answer

At the midpoint between the charges

Answer

Closer to the -Q charge

Answer

Closer to the +Q charge

Answer

At a point beyond the +Q charge

Question 51

A small object with a charge of +2.0 µC is placed in an electric field of strength 5.0 × 10^4 N/C. What is the magnitude of the electric force acting on the object?

Accepted Answer

100 N

Answer

2.5 × 10^4 N

Answer

2.0 × 10^-5 N

Answer

5.0 × 10^4 N

Question 52

Which of the following statements about electric field lines is NOT true?

Accepted Answer

Electric field lines can cross each other

Answer

Electric field lines point in the direction of the force on a positive charge

Answer

Electric field lines are closer together where the field is stronger

Answer

Electric field lines originate from positive charges

Question 53

A positive point charge is placed in an electric field. Which way will the charge move?

Accepted Answer

In the direction of the electric field

Answer

The charge will not move

Answer

Against the direction of the electric field

Answer

Perpendicular to the electric field

Question 54

Two identical charges are placed a distance 'r' apart. What happens to the force between them if the distance is doubled?

Accepted Answer

The force is reduced to one-quarter of its original value

Answer

The force is halved

Answer

The force is doubled

Question 55

Which of the following is NOT a unit of electric field strength?

Accepted Answer

Volt/meter^2

Answer

Newton/coulomb

Answer

Volt/meter

Answer

N/C

Question 56

A uniform electric field exists between two parallel plates. What is the direction of the electric field?

Accepted Answer

From the positive plate to the negative plate

Answer

The direction cannot be determined from the information given

Answer

From the negative plate to the positive plate

Answer

Perpendicular to the plates

Question 57

A test charge is placed in an electric field. What is the relationship between the force on the test charge and the electric field strength?

Accepted Answer

The force is directly proportional to the electric field strength

Answer

The force is inversely proportional to the electric field strength

Answer

There is no relationship between the force and the electric field strength

Question 58

A small charged sphere is suspended by a string in a uniform electric field. The sphere is observed to be at rest. What can you conclude about the electric field?

Accepted Answer

The electric field is balanced by the force of gravity

Answer

The electric field is zero

Answer

The electric field is very strong

Question 59

A positive charge is moved from a point of high potential to a point of low potential. What happens to the potential energy of the charge?

Accepted Answer

The potential energy decreases

Answer

The potential energy cannot be determined from the information given

Answer

The potential energy remains the same

Answer

The potential energy increases