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Methods of Electrostatic Charging and Coulomb’s Law Worksheet

Total questions: 150

Worksheet time: 1hrs 28mins

Name
Class
Date
1.

Electrostatics is the branch of physics that deals with

a)

electric charges at rest

b)

electric charges in motion

c)

magnetic fields in space

d)

electrical energy conversion

2.

Static electricity is produced when there is

a)

continuous current flow

b)

an imbalance of charges

c)

magnetic field interaction

d)

uniform charge distribution

3.

Which subatomic particle is primarily responsible for electrostatic charging?

a)

Proton

b)

Neutron

c)

Electron

d)

Nucleus

4.

According to Benjamin Franklin, electric charges are classified as

a)

strong and weak

b)

light and heavy

c)

positive and negative

d)

moving and stationary

5.

Like charges interacting with each other will

a)

attract strongly

b)

repel each other

c)

remain stationary

d)

cancel completely

6.

Unlike charges interacting with each other will

a)

repel equally

b)

attract each other

c)

remain unaffected

d)

neutralize instantly

7.

A neutral object is attracted to a charged object mainly because of

a)

magnetic induction

b)

charge separation

c)

electron destruction

d)

proton movement

8.

Which material allows charges to move freely throughout its structure?

a)

Insulator

b)

Semiconductor

c)

Conductor

d)

Dielectric

9.

Which material restricts the movement of electric charges?

a)

Conductor

b)

Insulator

c)

Ground wire

d)

Neutral object

10.

Charging by friction occurs when

a)

objects are placed nearby

b)

objects are rubbed together

c)

objects are electrically grounded

d)

objects are connected by wire

11.

In charging by friction, electrons are transferred based on

a)

object mass

b)

object temperature

c)

electron affinity

d)

electric field strength

12.

The triboelectric series ranks materials according to their

a)

electrical resistance

b)

atomic mass

c)

tendency to gain electrons

d)

ability to conduct current

13.

Charging by conduction is best described as charging by

a)

rubbing

b)

grounding

c)

contact

d)

induction

14.

When a charged object touches a neutral conductor, the conductor becomes

a)

oppositely charged

b)

temporarily polarized

c)

charged by contact

d)

magnetically active

15.

Charging by induction differs from conduction because it

a)

requires friction

b)

requires direct contact

c)

occurs without contact

d)

occurs only in insulators

16.

In charging by induction, grounding is necessary to

a)

remove excess charge

b)

increase electric force

c)

stop charge movement

d)

balance proton count

17.

After charging by induction and removing the ground, the object becomes

a)

neutrally charged

b)

oppositely charged

c)

randomly charged

d)

temporarily charged

18.

The law of conservation of charge states that electric charge

a)

can be created

b)

can be destroyed

c)

is always conserved

d)

disappears over time

19.

In a closed system, the total electric charge is

a)

always increasing

b)

always decreasing

c)

always constant

d)

always zero

20.

Lightning is an example of electrostatic discharge caused by

a)

magnetic attraction

b)

charge accumulation

c)

electron creation

d)

thermal expansion

21.

The branch of physics that studies electric charges at rest.

(a)  

22.

The condition produced by an imbalance of electric charges.

(a)  

23.

The negatively charged subatomic particle.

(a)  

24.

The positively charged subatomic particle.

(a)  

25.

The unit used to measure electric charge.

(a)  

26.

The process of charging objects by rubbing them together.

(a)  

27.

The tendency of a material to attract electrons.

(a)  

28.

A list that ranks materials according to electron transfer tendency.

(a)  

29.

Charging that occurs through direct contact.

(a)  

30.

Charging that occurs without direct contact.

(a)  

31.

The rearrangement of charges in a neutral object.

(a)  

32.

Materials that allow free movement of charges.

(a)  

33.

Materials that resist the movement of charges.

(a)  

34.

The principle stating that total charge remains constant.

(a)  

35.

The process that explains attraction between a charged and neutral object.

(a)  

36.

Coulomb’s law describes the force between

a)

two moving charges

b)

two charged particles

c)

a charge and a magnet

d)

a current and a wire

37.

The electrostatic force between two point charges is directly proportional to

a)

the distance between charges

b)

the square of the distance

c)

the product of the charges

d)

the sum of the charges

38.

The electrostatic force between two point charges is inversely proportional to

a)

the distance

b)

the square of the distance

c)

the product of charges

d)

the charge magnitude

39.

When the distance between two charges is doubled, the electrostatic force becomes

a)

twice as large

b)

four times larger

c)

half as large

d)

one-fourth as large

40.

Two positive charges placed near each other will

a)

attract strongly

b)

repel each other

c)

neutralize each other

d)

form a dipole

41.

A positive charge and a negative charge placed near each other will

a)

repel equally

b)

attract each other

c)

move randomly

d)

remain stationary

42.

The SI unit of electric charge is

a)

ampere

b)

newton

c)

coulomb

d)

volt

43.

The SI unit of electrostatic force is

a)

joule

b)

pascal

c)

newton

d)

watt

44.

Which quantity is represented by the constant k in Coulomb’s law?

a)

Charge density

b)

Electric field strength

c)

Coulomb constant

d)

Permittivity of air

45.

Two charges of 2 C and 3 C are separated by a distance of 1 m. Which change will increase the force between them?

a)

Decreasing the charge values

b)

Increasing the separation distance

c)

Increasing the charge values

d)

Changing charge signs

46.

Two charges of +2 C and −4 C are separated by 2 m. The force between them is

a)

attractive

b)

repulsive

c)

zero

d)

balanced

47.

If the charges in the previous item are moved 4 m apart, the force becomes

a)

four times larger

b)

twice as large

c)

half as large

d)

one-fourth as large

48.

Two equal charges exert a force of 10 N on each other. If the distance is reduced by half, the force becomes

a)

5 N

b)

10 N

c)

20 N

d)

40 N

49.

In Coulomb’s law, increasing both charges by a factor of 2 will make the force

a)

twice as large

b)

three times larger

c)

four times larger

d)

eight times larger

50.

Two charges lie along a straight line. Which method is used to find the net force on one charge?

a)

Scalar addition

b)

Vector addition

c)

Algebraic cancellation

d)

Charge averaging

51.

The principle used to determine net force in systems with more than two charges is

a)

Ohm’s Law

b)

Newton’s Third Law

c)

Superposition principle

d)

Conservation of charge

52.

A charge experiences two forces acting in opposite directions. The net force is found by

a)

adding magnitudes only

b)

subtracting magnitudes

c)

squaring each force

d)

ignoring directions

53.

If the net force on a charge is zero, this means

a)

no forces act on it

b)

forces are equal and opposite

c)

charges are neutral

d)

distance is infinite

54.

In a one-dimensional charge system, force direction is determined by

a)

charge sign only

b)

distance only

c)

magnitude only

d)

charge interaction

55.

Which situation results in the strongest electrostatic force?

a)

Small charges at large distance

b)

Large charges at small distance

c)

Small charges at small distance

d)

Large charges at large distance

56.

The force of attraction or repulsion between electric charges.

(a)  

57.

The law that quantifies the force between two point charges.

(a)  

58.

The principle stating that net force is the vector sum of individual forces.

(a)  

59.

The interaction between like charges.

(a)  

60.

The interaction between unlike charges.

(a)  

61.

The mathematical expression of Coulomb’s law.

(a)  

62.

The symbol for electric force.

(a)  

63.

The symbol for electric charge.

(a)  

64.

The symbol for separation distance between charges.

(a)  

65.

The constant used in Coulomb’s law.

(a)  

66.

SI unit of electric charge.

(a)  

67.

SI unit of electrostatic force.

(a)  

68.

SI unit of distance used in Coulomb’s law.

(a)  

69.

SI unit of the Coulomb constant (symbolic form acceptable).

(a)  

70.

A diagram showing all forces acting on an object.

(a)  

71.

The method used to solve forces acting along one straight line.

(a)  

72.

The method used to solve forces acting in two dimensions.

(a)  

73.

The condition when net force on a charge is zero.

(a)  

74.

The effect on force when distance is doubled.

(a)  

75.

The effect on force when distance is halved.

(a)  

76.

TEST BANK – CAPACITORS AND DIELECTRICS: A capacitor is best described as a device that

a)

stores electric charge

b)

produces electric current

c)

converts electrical energy

d)

increases circuit resistance

77.

TEST BANK – CAPACITORS AND DIELECTRICS: Capacitance refers to the ability of a conductor to

a)

store electric charge

b)

conduct electric current

c)

generate electric fields

d)

dissipate electric energy

78.

TEST BANK – CAPACITORS AND DIELECTRICS: The SI unit of capacitance is

a)

coulomb

b)

volt

c)

farad

d)

joule

79.

TEST BANK – CAPACITORS AND DIELECTRICS: Which expression correctly defines capacitance?

a)

C=VqC=\frac{V}{q}

b)

C=qΔVC=\frac{q}{\Delta V}

c)

C=q ΔVC=q\,\Delta V

d)

C=ΔVqC=\frac{\Delta V}{q}

80.

TEST BANK – CAPACITORS AND DIELECTRICS: In a parallel-plate capacitor, increasing plate area will

a)

decrease capacitance

b)

increase capacitance

c)

not affect capacitance

d)

eliminate electric field

81.

TEST BANK – CAPACITORS AND DIELECTRICS: In a parallel-plate capacitor, increasing plate separation will

a)

increase capacitance

b)

decrease capacitance

c)

not change capacitance

d)

reverse the electric field

82.

TEST BANK – CAPACITORS AND DIELECTRICS: The electric field between parallel plates in vacuum is given by

a)

E=Qε0AE=\frac{Q}{\varepsilon_0 A}

b)

E=ε0AQE=\frac{\varepsilon_0 A}{Q}

c)

E=QdAE=\frac{Q d}{A}

d)

E=AdQE=\frac{A d}{Q}

83.

TEST BANK – CAPACITORS AND DIELECTRICS: Which law is commonly used to derive capacitance formulas for symmetric geometries?

a)

Ohm’s Law

b)

Coulomb’s Law

c)

Gauss’s Law

d)

Kirchhoff’s Law

84.

TEST BANK – CAPACITORS AND DIELECTRICS: The capacitance of a cylindrical capacitor is expressed as

a)

total capacitance only

b)

capacitance per unit length

c)

charge per unit area

d)

voltage per unit charge

85.

TEST BANK – CAPACITORS AND DIELECTRICS: In capacitors connected in series, which quantity is the same for all capacitors?

a)

Voltage

b)

Energy

c)

Charge

d)

Capacitance

86.

TEST BANK – CAPACITORS AND DIELECTRICS: In capacitors connected in parallel, which quantity is the same for all capacitors?

a)

Charge

b)

Voltage

c)

Energy

d)

Capacitance

87.

TEST BANK – CAPACITORS AND DIELECTRICS: The equivalent capacitance of capacitors in series is always

a)

greater than each capacitor

b)

equal to each capacitor

c)

less than each capacitor

d)

independent of values

88.

TEST BANK – CAPACITORS AND DIELECTRICS: The equivalent capacitance of capacitors in parallel is

a)

the reciprocal sum

b)

the difference of values

c)

the sum of capacitances

d)

the product of values

89.

TEST BANK – CAPACITORS AND DIELECTRICS: Energy stored in a capacitor is given by

a)

U=qVU=qV

b)

U=12CV2U=\tfrac{1}{2}CV^{2}

c)

U=12qVU=\tfrac{1}{2}qV

d)

U=V2CU=\tfrac{V^{2}}{C}

90.

TEST BANK – CAPACITORS AND DIELECTRICS: Increasing the voltage across a capacitor will

a)

decrease stored energy

b)

not affect stored energy

c)

increase stored energy

d)

remove stored energy

91.

TEST BANK – CAPACITORS AND DIELECTRICS: The energy stored in a capacitor is located primarily in the

a)

plates only

b)

connecting wires

c)

electric field

d)

battery

92.

TEST BANK – CAPACITORS AND DIELECTRICS: A dielectric placed between capacitor plates will

a)

reduce capacitance

b)

increase capacitance

c)

eliminate the field

d)

neutralize charges

93.

TEST BANK – CAPACITORS AND DIELECTRICS: Dielectric strength refers to the

a)

ability to conduct charge

b)

maximum electric field sustained

c)

minimum stored energy

d)

resistance to heating

94.

TEST BANK – CAPACITORS AND DIELECTRICS: The dielectric constant is a measure of

a)

charge density

b)

field direction

c)

capacitance increase

d)

voltage reduction

95.

Multiple Choice (20 items). When a dielectric is inserted into an isolated charged capacitor, the electric field

a)

increases

b)

decreases

c)

becomes zero

d)

reverses direction

96.

PART II. IDENTIFICATION. Provide the term. Device that stores electrical energy

(a)  

97.

PART II. IDENTIFICATION. Provide the term. Ability of a conductor to store charge

(a)  

98.

PART II. IDENTIFICATION. Provide the term. Two-plate capacitor geometry

(a)  

99.

PART II. IDENTIFICATION. Provide the term. Law used for symmetric electric fields

(a)  

100.

PART II. IDENTIFICATION. Provide the term. Quantity stored on capacitor plates

(a)  

101.

PART II. IDENTIFICATION. Provide the term. Difference in electric potential between plates

(a)  

102.

PART II. IDENTIFICATION. Provide the term. Relationship between charge and voltage

(a)  

103.

PART II. IDENTIFICATION. Provide the term. Capacitance symbol

(a)  

104.

PART II. IDENTIFICATION. Provide the term. Equivalent single capacitor in a system

(a)  

105.

PART II. IDENTIFICATION. Provide the term. Capacitors with equal charge

(a)  

106.

PART II. IDENTIFICATION. Provide the term. Capacitors with equal voltage

(a)  

107.

PART II. IDENTIFICATION. Provide the term. Capacitor connection with smaller equivalent capacitance

(a)  

108.

PART II. IDENTIFICATION. Provide the term. Capacitor connection with larger equivalent capacitance

(a)  

109.

PART II. IDENTIFICATION. Provide the term. Energy stored in a capacitor

(a)  

110.

PART II. IDENTIFICATION. Provide the term. Work done to charge a capacitor

(a)  

111.

PART II. IDENTIFICATION. Provide the term. Material placed between capacitor plates

(a)  

112.

PART II. IDENTIFICATION. Provide the term. Maximum field a dielectric can withstand

(a)  

113.

PART II. IDENTIFICATION. Provide the term. Factor by which capacitance increases with dielectric

(a)  

114.

PART II. IDENTIFICATION. Provide the term. Energy per unit volume in an electric field

(a)  

115.

PART II. IDENTIFICATION. Provide the term. Geometry where capacitance depends on radius

(a)  

116.

PART III. UNITS AND SYMBOLS (15 items). Give the correct unit or symbol. Unit of capacitance

(a)  

117.

PART III. UNITS AND SYMBOLS (15 items). Give the correct unit or symbol. Symbol for capacitance

(a)  

118.

PART III. UNITS AND SYMBOLS (15 items). Give the correct unit or symbol. Unit of electric charge

(a)  

119.

PART III. UNITS AND SYMBOLS (15 items). Give the correct unit or symbol. Symbol for electric charge

(a)  

120.

PART III. UNITS AND SYMBOLS (15 items). Give the correct unit or symbol. Unit of potential difference

(a)  

121.

PART III. UNITS AND SYMBOLS (15 items). Give the correct unit or symbol. Symbol for potential difference

(a)  

122.

PART III. UNITS AND SYMBOLS (15 items). Give the correct unit or symbol. Unit of electric field

(a)  

123.

PART III. UNITS AND SYMBOLS (15 items). Give the correct unit or symbol. Symbol for electric field

(a)  

124.

PART III. UNITS AND SYMBOLS (15 items). Give the correct unit or symbol. Unit of stored energy

(a)  

125.

PART III. UNITS AND SYMBOLS (15 items). Give the correct unit or symbol. Symbol for stored energy

(a)  

126.

PART III. UNITS AND SYMBOLS (15 items). Give the correct unit or symbol. Symbol for permittivity of free space

(a)  

127.

PART III. UNITS AND SYMBOLS (15 items). Give the correct unit or symbol. Unit of permittivity

(a)  

128.

PART III. UNITS AND SYMBOLS (15 items). Give the correct unit or symbol. Symbol for dielectric constant

(a)  

129.

PART III. UNITS AND SYMBOLS (15 items). Give the correct unit or symbol. Unit of plate separation

(a)  

130.

PART III. UNITS AND SYMBOLS (15 items). Give the correct unit or symbol. Unit of plate area

(a)  

131.

PART IV. PROBLEM SOLVING (Show complete solutions.) A parallel-plate capacitor has an area of 3.0 m² and a plate separation of 2.0 mm. a) Calculate its capacitance. b) Determine the charge stored when connected to a 12-V battery.

4 lines
132.

PART IV. PROBLEM SOLVING (Show complete solutions.) Two capacitors of 6.0 µF and 3.0 µF are connected a) in series b) in parallel. Find the equivalent capacitance in each case.

4 lines
133.

PART IV. PROBLEM SOLVING (Show complete solutions.) A 10-µF capacitor is charged to 400 V. a) Determine the energy stored. b) Predict the change in energy if the voltage is doubled.

4 lines
134.

PART IV. PROBLEM SOLVING (Show complete solutions.) A cylindrical capacitor has inner radius 2 mm, outer radius 8 mm, and length 0.50 m. a) Determine the electric field expression. b) Calculate the capacitance.

4 lines
135.

PART IV. PROBLEM SOLVING (Show complete solutions.) A dielectric with dielectric constant 4 is inserted between the plates of a capacitor. a) How does the capacitance change? b) How does the electric field change if the capacitor is isolated?

4 lines
136.

TEST BANK A – ELECTRIC CURRENT. PART I. MULTIPLE CHOICE (20 items). Electric current is best defined as

a)

energy transferred per unit time

b)

charge flowing per unit time

c)

force acting on charged particles

d)

motion of electrons only

137.

TEST BANK A – ELECTRIC CURRENT. PART I. MULTIPLE CHOICE (20 items). The SI unit of electric current is

a)

coulomb

b)

volt

c)

ampere

d)

ohm

138.

TEST BANK A – ELECTRIC CURRENT. PART I. MULTIPLE CHOICE (20 items). In metals, the charge carriers responsible for current are

a)

protons

b)

neutrons

c)

electrons

d)

ions

139.

Conventional current direction is defined as the direction of

a)

electron flow

b)

negative charge flow

c)

positive charge flow

d)

random charge motion

140.

If more charge flows through a wire per second, the current

a)

decreases

b)

remains constant

c)

increases

d)

becomes zero

141.

Average current is expressed mathematically as

a)

I=qtI=qt

b)

I=qtI=\dfrac{q}{t}

c)

I=tqI=tq

d)

I=tqI=\dfrac{t}{q}

142.

Instantaneous current is defined as

a)

total charge transferred

b)

average current over time

c)

limit of average current

d)

charge per unit area

143.

The direction of current in a wire carrying electrons is

a)

same as electron flow

b)

opposite electron flow

c)

perpendicular to electron flow

d)

independent of electron motion

144.

Drift velocity refers to the

a)

random thermal motion of charges

b)

average net motion of charges

c)

speed of electric field

d)

acceleration of electrons

145.

Drift velocity of electrons in a conductor is generally

a)

very large

b)

close to light speed

c)

very small

d)

exactly zero

146.

Increasing the cross-sectional area of a wire while keeping current constant will

a)

increase drift velocity

b)

decrease drift velocity

c)

not affect drift velocity

d)

reverse drift velocity

147.

Current density is defined as

a)

charge per unit volume

b)

current per unit area

c)

force per unit charge

d)

energy per unit area

148.

The SI unit of current density is

a)

A

b)

A/m

c)

A/m²

d)

C/m²

149.

Which equation correctly relates current and drift velocity?

a)

I=nqAI=nqA

b)

I=nq vd AI=nq\,v_d\,A

c)

I=q vdI=q\,v_d

d)

I=n vd AI=n\,v_d\,A

150.

Current does not depend on the

a)

sign of charge

b)

amount of charge

c)

time interval

d)

cross-sectional area

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