Electric Fields: Interactive Learning Quizzes for Year 12 Physics

Question 1

What is the magnitude of the electric field intensity at a distance 'r' from a point charge 'q'?

Accepted Answer

$$rac{1}{4 pi epsilon_0} rac{q}{r^2}$$

Answer

$$rac{1}{4 pi epsilon_0} rac{q}{r}$$

Answer

$$rac{1}{4 pi epsilon_0} qr$$

Answer

$$rac{1}{4 pi epsilon_0} rac{q}{r^3}$$

Question 2

Inside a uniformly charged sphere, the electric field intensity is:

Accepted Answer

Zero

Answer

$$rac{1}{4 pi epsilon_0} rac{Q}{r^2}$$

Answer

$$rac{1}{4 pi epsilon_0} rac{Q}{r}$$

Answer

$$rac{4 pi epsilon_0}{Q} r^2$$

Question 3

An electron is placed at the center of a hollow conducting sphere. What is the electric field inside the sphere?

Accepted Answer

Zero

Answer

kq/r^2

Answer

kq/r

Answer

-kq/r^2

Question 4

The electric field near the surface of a charged conductor is:

Accepted Answer

Perpendicular to the surface of the conductor

Answer

Parallel to the surface of the conductor

Answer

Zero

Answer

Non-uniform

Question 5

Which of the following is a unit vector representing the direction of an electric field?

Accepted Answer

E/|E|

Answer

E

Answer

-E

Answer

-E/|E|

Question 6

The electric potential at a point due to a point charge Q is given by:

Accepted Answer

kq/r

Answer

-kq/r

Answer

kq/r^2

Answer

-kq/r^2

Question 7

Equipotential surfaces are surfaces where:

Accepted Answer

The electric potential is constant

Answer

The electric field is zero

Answer

The charge density is constant

Answer

The electric flux is maximum

Question 8

The work done in moving a charge Q from point A to point B in an electric field E is:

Accepted Answer

QE

Answer

-QE

Answer

Q/E

Answer

-Q/E

Question 9

Which of the following accurately describes the interaction between electric charges?

Accepted Answer

Positive charges attract negative charges.

Answer

Positive charges are drawn to positive charges.

Answer

Negative charges repel negative charges.

Answer

Positive charges repel positive charges, and negative charges attract negative charges.

Question 10

The concept of electric field is defined as:

Accepted Answer

The force experienced by a hypothetical positive point charge placed at a given point in space

Answer

The force experienced by a hypothetical negative point charge placed at a given point in space

Answer

The force experienced by any charged particle placed at a given point in space

Answer

The potential energy possessed by a point charge placed at a given point in space

Question 11

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

Accepted Answer

All of the above statements are consequences of Gauss's law

Answer

Electric field lines must start from positive charges and end on negative charges

Answer

The electric field inside a conductor in electrostatic equilibrium is zero

Answer

The net electric flux through any closed surface surrounding a point charge is proportional to the magnitude of the charge

Question 12

Consider a spherical conductor of radius 10.0 cm carrying a net charge of +1.0 μ. Determine the electric field (E) inside the conductor.

Accepted Answer

0 N/C

Answer

9.0 x 10^4 N/C

Answer

1.8 x 10^5 N/C

Answer

3.6 x 10^5 N/C

Question 13

The SI unit of electric field is:

Accepted Answer

Volt per meter

Answer

Coulomb per meter

Answer

Newton per meter

Answer

Ampere per meter

Question 14

Two point charges, +2 μC and -4 μC, are placed 10 cm apart. The electric field at a point midway between the charges is:

Accepted Answer

2.7 × 10^5 N/C

Answer

0 N/C

Answer

5.4 × 10^5 N/C

Answer

8.1 × 10^5 N/C

Question 15

The electric field lines around a positively charged sphere are:

Accepted Answer

Directed outward

Answer

Directed inward

Answer

Circular

Answer

Non-existent

Question 16

Electric potential at a point is defined as:

Accepted Answer

Work done to bring a unit positive charge from infinity to that point

Answer

Electric field at that point

Answer

Electric flux through that point

Answer

Charge density at that point

Question 17

Which property is NOT characteristic of electric fields?

Accepted Answer

Existence exclusively within a medium

Answer

Conservative in nature

Answer

Representable by field lines

Answer

Ability to exert forces on charged particles

Question 18

According to Coulomb's Law, the electric field magnitude (E) at a distance (r) from a point charge (Q) is expressed as:

Accepted Answer

E = kQ/r^2

Answer

E = Q/r^2

Answer

E = Q/kr^2

Answer

E = r^2Q/k

Question 19

Which charge distribution produces a uniform electric field?

Accepted Answer

Infinite sheet of charge

Answer

Point charge

Answer

Charged sphere

Answer

Charged rod

Question 20

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

Accepted Answer

Enclosed charge

Answer

Surface area

Answer

Electric field within the surface

Answer

Permittivity of the enclosed material

Question 21

Which metric unit expresses the strength of an electric field?

Accepted Answer

Newton per Coulomb

Answer

Coulomb

Answer

Volt

Answer

Farad

Question 22

A point charge with a magnitude of +2 μC is positioned at the origin. Determine the electric field strength at a distance of 0.5 meters from this charge.

Accepted Answer

57.6 N/C

Answer

144 N/C

Answer

288 N/C

Answer

576 N/C

Question 23

Which material among the following is a good conductor of electricity?

Accepted Answer

Copper

Answer

Rubber

Answer

Plastic

Answer

Wood

Question 24

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

Accepted Answer

Inversely proportional to the square of the distance from the charge.

Answer

Proportional to the square of the distance from the charge.

Answer

Proportional to the distance from the charge.

Answer

Inversely proportional to the distance from the charge.

Question 25

Gauss's law relates:

Accepted Answer

Electric flux through a surface to the enclosed charge.

Answer

Electric potential inside a conductor to the enclosed charge.

Answer

Electric field strength at a point to the enclosed charge.

Answer

Capacitance of a capacitor to the enclosed charge.

Question 26

An electric field vector points from point A to point B. Which of the following statements is true?

Accepted Answer

The electric potential at point B is higher than at point A.

Answer

The electric potential at point A is higher than at point B.

Answer

The electric potential is the same at both points.

Answer

The direction of the electric field vector is from B to A.

Question 27

The electric field inside a conductor is:

Accepted Answer

Zero.

Answer

Non-zero and uniform.

Answer

Non-zero and non-uniform.

Answer

Dependent on the shape of the conductor.

Question 28

What is the SI unit of electric charge?

Accepted Answer

Coulomb

Answer

Ampere

Answer

Volt

Answer

Ohm

Question 29

A uniform electric field of 200 V/m is applied in the x-direction. What is the potential difference between two points 5 cm apart along the x-axis?

Accepted Answer

5 V

Answer

1 V

Answer

10 V

Answer

20 V

Question 30

Which of the following materials is classified as an electrical insulator?

Accepted Answer

Rubber

Answer

Copper

Answer

Silver

Answer

Iron

Question 31

A positive point charge is placed at the origin. What is the direction of the electric field at a point to the right of the charge on the x-axis?

Accepted Answer

Away from the origin

Answer

Towards the origin

Answer

Parallel to the x-axis

Answer

Perpendicular to the x-axis

Question 32

A uniform electric field is created between two parallel plates separated by a distance 'd'. If the electric field strength is 'E', what is the potential difference between the plates?

Accepted Answer

Ed

Answer

Ed/2

Answer

E^2d

Answer

E/d

Question 33

Gauss's law states that:

Accepted Answer

Electric flux through any closed surface is proportional to the charge enclosed within the surface.

Answer

Electric field at any point is proportional to the charge at that point.

Answer

Net electric field inside a conductor is always zero.

Answer

Electric potential at any point is proportional to the charge at that point.

Question 34

Which of these materials is a good conductor of electricity?

Accepted Answer

Copper

Answer

Rubber

Answer

Wood

Answer

Glass

Question 35

Two equal but opposite point charges are placed a distance 'd' apart. What is the electric field strength at a point on the perpendicular bisector of the line joining the charges?

Accepted Answer

Zero

Answer

Proportional to d

Answer

Proportional to d²

Answer

Proportional to 1/d

Question 36

Which of the following is a dielectric material?

Accepted Answer

Rubber

Answer

Metal

Answer

Salt water

Answer

Copper

Question 37

Which SI unit quantifies the strength and direction of an electric field?

Accepted Answer

Newton per Coulomb

Answer

Coulomb

Answer

Volt

Answer

Ampere

Question 38

A charge of +2 × 10^-6 C is positioned at the origin. Determine the electric field strength at a distance of 0.03 m from the charge.

Accepted Answer

1.8 × 10^6 N/C

Answer

9 × 10^6 N/C

Answer

6 × 10^6 N/C

Answer

3 × 10^6 N/C

Question 39

A spherical conductor with a radius of R carries a charge of +Q. What is the electric field strength at a point within the conductor?

Accepted Answer

Zero

Answer

Q/4πε₀R

Answer

Q/ε₀R

Answer

Q/2πε₀R

Question 40

Identify the equation representing Gauss's law.

Accepted Answer

∮ E ⋅ dA = Q/ε₀

Answer

E = kQ/r^2

Answer

V = kQ/r

Answer

F = kQq/r^2

Question 41

Which material exhibits good electrical conductivity?

Accepted Answer

Copper

Answer

Rubber

Answer

Wood

Answer

Glass

Question 42

The electric potential at a point is:

Accepted Answer

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

Answer

The force per unit charge at that point

Answer

The electric field at that point

Answer

The potential energy per unit charge at that point

Question 43

A small, positively charged sphere is placed in a uniform electric field. What is the direction of the electric force acting on the sphere?

Accepted Answer

In the same direction as the electric field.

Answer

Perpendicular to the direction of the electric field.

Answer

Opposite to the direction of the electric field.

Answer

The force is zero.

Question 44

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

Accepted Answer

At the midpoint between the charges.

Answer

Nowhere along the line.

Answer

Closer to the +Q charge.

Answer

Closer to the -Q charge.

Question 45

A charged particle is moving in a uniform electric field. Which of the following factors does NOT affect the magnitude of the electric force acting on the particle?

Accepted Answer

The velocity of the particle.

Answer

The magnitude of the electric field.

Answer

The mass of the particle.

Answer

The charge of the particle.

Question 46

A Gaussian surface encloses a point charge of +Q. What is the electric flux through the surface, according to Gauss's law?

Accepted Answer

Q/ε₀

Answer

0

Answer

Q

Answer

ε₀Q

Question 47

A long, straight wire carries a uniform charge density. What is the shape of the electric field lines around the wire?

Accepted Answer

Radial lines emanating from the wire.

Answer

Concentric circles around the wire.

Answer

Spiral lines around the wire.

Answer

Straight lines parallel to the wire.

Question 48

A charged spherical shell of radius 'R' carries a uniform charge density. What is the electric field inside the shell (r < R)?

Accepted Answer

Zero.

Answer

Proportional to 1/r².

Answer

Constant and non-zero.

Answer

Proportional to r.

Question 49

A parallel-plate capacitor has a capacitance 'C'. If the distance between the plates is doubled, what happens to the capacitance?

Accepted Answer

The capacitance is halved (C/2).

Answer

The capacitance remains the same (C).

Answer

The capacitance doubles (2C).

Answer

The capacitance quadruples (4C).

Question 50

Two identical conducting spheres, initially uncharged, are brought into contact. One sphere is then given a positive charge. What is the charge on the other sphere after they are separated?

Accepted Answer

Positive.

Answer

Zero.

Answer

Negative.

Question 51

A uniform electric field is directed from left to right. A negatively charged particle is released from rest in this field. In which direction will the particle move?

Accepted Answer

To the left.

Answer

Downward.

Answer

Upward.

Answer

To the right.

Question 52

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/4πε₀

Answer

Q/ε₀

Answer

Q/12ε₀