Electric Potential and Capacitance: Interactive Learning Quizzes

Question 1

Which of the following best describes electric potential energy?

Accepted Answer

The energy a charged particle possesses due to its position within an electric field

Answer

The energy stored within an electric field

Answer

The work required to move a charged particle against an electric field

Answer

The energy transferred when two charged particles interact

Question 2

What is the primary function of a dielectric material in a capacitor?

Accepted Answer

To increase capacitance

Answer

To reduce voltage between plates

Answer

To prevent short circuits

Answer

To store electrical energy

Question 3

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

Accepted Answer

10 mJ

Answer

5 mJ

Answer

50 mJ

Answer

100 mJ

Question 4

Which of the following materials is a good conductor and cannot be used as a dielectric?

Accepted Answer

Copper

Answer

Rubber

Answer

Ceramic

Answer

Glass

Question 5

The polarization of a dielectric material is defined as:

Accepted Answer

The alignment of dipoles in the material

Answer

The displacement of charges within the material

Answer

The presence of free charges in the material

Answer

The change in shape of the material

Question 6

The dielectric constant of a material is a measure of its ability to:

Accepted Answer

Increase the capacitance of a capacitor

Answer

Conduct electricity

Answer

Store charge

Answer

Oppose the formation of an electric field

Question 7

Which of the following materials is a poor dielectric?

Accepted Answer

Pure water

Answer

Ceramic

Answer

Teflon

Answer

Glass

Question 8

A point charge Q is placed at the center of a spherical conducting shell of radius R. What is the electric potential at a point inside the shell?

Accepted Answer

0

Answer

Q/4πε₀R

Answer

Q/2πε₀R

Answer

Q/πε₀R

Question 9

What is the SI unit of capacitance?

Accepted Answer

Farad

Answer

Volt

Answer

Ampere

Answer

Ohm

Question 10

What is the relationship between electric potential and electric field?

Accepted Answer

Electric field is the negative gradient of electric potential.

Answer

Electric potential is directly proportional to electric field.

Answer

Electric potential is inversely proportional to electric field.

Question 11

In selecting dielectric materials for capacitors, which characteristics are crucial to consider?

Accepted Answer

Dielectric constant and breakdown strength

Answer

Thermal conductivity and capacitance

Answer

Density and cost

Answer

Dielectric constant and thermal expansion coefficient

Question 12

How is electrical energy stored within a capacitor?

Accepted Answer

By separating charges on the capacitor plates, creating an electric field between them.

Answer

By increasing the current flowing through the capacitor.

Answer

By converting electrical energy into magnetic energy.

Answer

By decreasing the voltage across the capacitor.

Question 13

Which unit is used to express electric potential?

Accepted Answer

Volt

Answer

Joule

Answer

Coulomb

Question 14

Which device utilizes electric potential and capacitance to store electrical energy?

Accepted Answer

Capacitor

Answer

Inductor

Answer

Resistor

Answer

Diode

Question 15

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

Accepted Answer

Copper

Answer

Wood

Answer

Plastic

Answer

Rubber

Question 16

When a capacitor is connected to a sinusoidal alternating current (AC) voltage source, what is the phase difference between the current and voltage?

Accepted Answer

90 degrees

Answer

0 degrees

Answer

180 degrees

Answer

45 degrees

Question 17

What is the resonant frequency of an LC circuit?

Accepted Answer

1 / (2π√LC)

Answer

1 / LC

Answer

2π√LC

Answer

LC

Question 18

Which of the following materials is a good dielectric?

Accepted Answer

Rubber

Answer

Aluminum

Answer

Steel

Answer

Copper

Question 19

Which of the following is a unit of capacitance?

Accepted Answer

Farad

Answer

Volt

Answer

Coulomb

Answer

Henry

Question 20

Which of the following factors does NOT affect the capacitance of a parallel-plate capacitor?

Accepted Answer

Plate thickness

Answer

Plate area

Answer

Distance between plates

Answer

Permittivity of the dielectric