Electric Fields: Interactive Learning Quizzes for Physics Students

Question 1

Which of the following is a direct consequence of Gauss's law?

Accepted Answer

The net electric flux through a closed surface is directly proportional to the enclosed charge.

Answer

The electric field is continuous across all boundaries.

Answer

The electric field is perpendicular to equipotential surfaces.

Answer

Charge is always conserved.

Question 2

A parallel-plate capacitor has plates with an area of 0.2 m^2 and a separation of 1 cm. If the capacitor is charged to a potential difference of 100 V, what is the electric field between the plates?

Accepted Answer

1000 N/C

Answer

500 N/C

Answer

2000 N/C

Answer

5000 N/C

Question 3

The SI unit of electric potential is:

Accepted Answer

Volt

Answer

Joule

Answer

Coulomb

Answer

Newton

Question 4

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

Accepted Answer

Volt per meter

Answer

Newton per meter

Answer

Coulomb per meter

Answer

Ampere per meter

Question 5

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

Accepted Answer

Charge enclosed within the surface

Answer

Area of the surface

Answer

Electric field strength at the surface

Answer

Polarization of the surface

Question 6

Which of the following is an equipotential surface?

Accepted Answer

A surface where the potential energy is constant

Answer

A plane perpendicular to the electric field

Answer

A surface where the electric field is zero

Answer

A surface where the charge density is constant

Question 7

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

Accepted Answer

Copper

Answer

Rubber

Answer

Glass

Answer

Wood

Question 8

The electric field inside a capacitor is:

Accepted Answer

Uniform

Answer

Zero

Answer

Non-uniform

Answer

Proportional to the capacitance

Question 9

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

Accepted Answer

Charge enclosed by the surface

Answer

Electric field strength at the surface

Answer

Surface area of the surface

Answer

Volume of the enclosed region

Question 10

Electric potential at a point is defined as:

Accepted Answer

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

Answer

Electric field strength at that point

Answer

Charge density at that point

Answer

Energy stored per unit volume at that point

Question 11

Electric field lines of a positive point charge:

Accepted Answer

Point away from the charge

Answer

Point towards the charge

Answer

Are perpendicular to the charge

Answer

Form closed loops

Question 12

According to Gauss's law, what is the net electric flux through a closed surface 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 volume enclosed by the surface

Question 13

In a uniform electric field within a specific region of space, what is the relationship between the electric potential difference (V) and the distance (d) between two points within that region?

Accepted Answer

V = Ed

Answer

V = Ed^2

Answer

V = E/d

Answer

V = E/d^2

Question 14

Which type of material is most likely to possess a high dielectric constant?

Accepted Answer

Ceramic

Answer

Metal

Answer

Plastic

Answer

Wood

Question 15

An electron is released from rest within a uniform electric field. What motion will the electron experience?

Accepted Answer

Uniform acceleration

Answer

Constant velocity

Answer

Non-uniform acceleration

Answer

No acceleration

Question 16

What is a defining characteristic of equipotential surfaces?

Accepted Answer

They have the same electric potential at all points

Answer

They are perpendicular to the electric field lines

Answer

They intersect at right angles

Answer

They are always closed surfaces

Question 17

What is the electric field strength within a conductor?

Accepted Answer

Zero

Answer

Non-zero and constant

Answer

Non-zero and varying

Answer

Infinite

Question 18

Which unit is used to measure electric field strength?

Accepted Answer

Volts per meter

Answer

Coulombs per square meter

Answer

Newtons per coulomb

Answer

Farads per meter

Question 19

How is the electric potential energy of a system of point charges described?

Accepted Answer

Zero if the charges are separated by infinite distance

Answer

Negative for all charge configurations

Answer

Positive for all charge configurations

Answer

Zero if the charges have the same sign

Question 20

Which of the following describes the direction of electric field lines surrounding a positive charge?

Accepted Answer

Pointing outward away from the charge

Answer

Pointing inward towards the charge

Answer

Clockwise circular

Answer

Counterclockwise circular

Question 21

Gauss's law relates the electric field to:

Accepted Answer

The total charge within a closed surface

Answer

The potential energy of the field

Answer

The force on a charge within the field

Answer

The capacitance of a capacitor

Question 22

A uniform electric field of 500 N/C is applied in the x-direction. Calculate the force experienced by a proton (charge = +1.6 x 10^-19 C) placed in this field.

Accepted Answer

8.0 x 10^-17 N in the x-direction

Answer

8.0 x 10^-17 N in the y-direction

Answer

8.0 x 10^-19 N in the x-direction

Answer

8.0 x 10^-19 N in the y-direction

Question 23

Which shape would have the most uniform electric field inside?

Accepted Answer

Sphere

Answer

Cube

Answer

Cylinder

Answer

Cone

Question 24

A dielectric material with a dielectric constant of 4 is placed between the plates of a capacitor. How does the capacitance change?

Accepted Answer

Increases by a factor of 4

Answer

Decreases by a factor of 4

Answer

Increases by a factor of 16

Answer

Decreases by a factor of 16

Question 25

Which of the following is a vector quantity used in electrostatics?

Accepted Answer

Electric field

Answer

Electric potential

Answer

Charge

Answer

Capacitance

Question 26

An electron (charge = -1.6 x 10^-19 C) is moved through a region where the electric potential changes from 100 V to 200 V. How much work is done on the electron?

Accepted Answer

3.2 x 10^-17 J

Answer

1.6 x 10^-17 J

Answer

1.6 x 10^-16 J

Answer

3.2 x 10^-16 J

Question 27

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

Accepted Answer

True

Answer

False

Question 28

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

Accepted Answer

Copper

Answer

Plastic

Answer

Wood

Answer

Rubber

Question 29

The electric potential at a point is defined as the work done per unit charge in moving a charge from what reference point to that point?

Accepted Answer

Infinity

Answer

The center of the electric field

Answer

The origin of the coordinate system

Answer

The surface of the conductor

Question 30

Which of the following is a unit of electric potential?

Accepted Answer

Volt

Answer

Coulomb

Answer

Farad

Answer

Tesla

Question 31

The electric potential due to a point charge 'q' at a distance 'r' is given by:

Accepted Answer

k * q / r^2

Answer

k * q * r

Answer

k * q / r

Answer

k * q * r^2

Question 32

A capacitor stores energy primarily in the form of:

Accepted Answer

Electric field between its plates

Answer

Magnetic field around its plates

Answer

Gravitational field between its plates

Answer

Kinetic energy of its electrons

Question 33

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

Accepted Answer

Coulomb (C)

Answer

Gauss (G)

Answer

Farad (F)

Question 34

Consider a point charge Q located at the origin. The electric field intensity E at a distance r from Q is given by:

Accepted Answer

E = kQ / r^2

Answer

E = kQ^2 / r

Answer

E = -kQ^2 / r^2

Question 35

Which of the following statements about electric fields is true?

Accepted Answer

Electric fields exert forces on charged particles.

Answer

Electric fields are always radial.

Answer

Electric fields exist only around conductors.

Question 36

Gauss's theorem relates:

Accepted Answer

Electric flux through a closed surface to the enclosed charge.

Answer

Electric field intensity to the potential difference.

Question 37

The electric potential at a point is defined as:

Accepted Answer

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

Answer

Electric field intensity at that point.

Answer

Force exerted on a unit charge at that point.

Question 38

Consider a region where the electric potential is V = Ax^2 + By^2, where A and B are constants. The electric field intensity at (x, y) is given by:

Accepted Answer

E = (2Ax, 2By)

Answer

E = (x^2, y^2)

Answer

E = (A, B)

Question 39

The electric field between the plates of a parallel-plate capacitor filled with a dielectric is:

Accepted Answer

Uniform and given by V / d

Answer

Proportional to the charge on the capacitor.

Answer

Non-uniform and varies with distance from the plates.

Question 40

The capacitance of a parallel-plate capacitor can be increased by:

Accepted Answer

Increasing the plate area and decreasing the distance between the plates.

Answer

Decreasing the plate area and increasing the distance between the plates.

Question 41

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

Accepted Answer

The total charge enclosed by the surface

Answer

The permittivity of the medium inside the surface

Answer

The potential difference between the surface and infinity

Answer

The area of the surface

Question 42

A point charge Q is placed at the center of a cube. What is the electric flux through one face of the cube?

Accepted Answer

Q/6ε₀

Answer

Q/8ε₀

Answer

Q/4ε₀

Answer

Q/2ε₀

Question 43

The electric potential at a point due to a point charge is:

Accepted Answer

Inversely proportional to the distance from the charge

Answer

Directly proportional to the distance from the charge

Answer

Independent of the distance from the charge

Question 44

Electric field lines due to a positive point charge:

Accepted Answer

Radiate outwards from the charge

Answer

Form closed loops

Answer

Converge towards the charge

Question 45

The electric field inside a conductor in electrostatic equilibrium is:

Accepted Answer

Zero

Answer

Equal to the electric field just outside the conductor

Answer

Proportional to the charge on the conductor

Answer

Inversely proportional to the radius of the conductor

Question 46

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

Question 47

The energy stored in a capacitor is:

Accepted Answer

Proportional to the square of the charge stored on it

Answer

Independent of the charge stored on it

Answer

Proportional to the charge stored on it

Question 48

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

Accepted Answer

Uniform

Answer

Non-uniform and stronger in the center

Answer

Zero

Answer

Non-uniform and stronger near the edges

Question 49

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

Accepted Answer

Copper

Answer

Wood

Answer

Glass

Answer

Rubber

Question 50

Which of these is **NOT** a characteristic of electric fields?

Accepted Answer

They can be completely blocked by metal.

Answer

They are vector quantities.

Answer

They can attract or repel charged particles.

Answer

They are generated by stationary charges.

Question 51

According to Gauss's Law, the total electric flux passing through a closed surface is directly proportional to:

Accepted Answer

The net electric charge enclosed by the surface.

Answer

The potential difference between the surface and infinity.

Answer

The current flowing through the surface.

Answer

The work done by the electric field on a charge inside the surface.

Question 52

If an electron is placed in a uniform electric field, what will be the direction of the force acting on it?

Accepted Answer

Opposite to the direction of the electric field.

Answer

Perpendicular to the direction of the electric field.

Answer

Zero force.

Answer

Parallel to the direction of the electric field.

Question 53

What is the definition of electric potential at a specific point in space?

Accepted Answer

The amount of work required to bring a unit positive charge from infinity to that point.

Answer

The strength of the electric field at that point.

Answer

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

Question 54

Which of the following units is used to measure electric potential?

Accepted Answer

Volt (V)

Answer

Coulomb (C)

Answer

Farad (F)

Answer

Ampere (A)

Question 55

A parallel plate capacitor has a capacitance of 10 μF with its plates separated by 1 mm. What is the electric field strength between the plates?

Accepted Answer

1000 V/m

Answer

100 V/m

Answer

10 V/m

Question 56

Which of the following materials is an excellent conductor of electricity?

Accepted Answer

Copper

Answer

Glass

Answer

Rubber

Answer

Wood

Question 57

How do the electric field lines of a point charge behave?

Accepted Answer

They radiate outwards from the charge.

Answer

They form closed loops around the charge.

Answer

They converge towards the charge.

Answer

They remain parallel to each other.