WorksheetsElectric Fields, Flux and Potential
Total questions: 86
Worksheet time: 43mins
Name
Class
Date
1.
What is the unit of electric field?
a)
N/C (Newton per Coulomb)
b)
C/N (Coulomb per Newton)
c)
V/m (Volt per meter)
d)
J/C (Joule per Coulomb)
2.
Which of the following charges has electric field lines pointing outward?
a)
Positive charge
b)
Negative charge
c)
Neutral charge
d)
No charge
3.
What force does a charge experience in an electric field?
a)
Electric force (F)
b)
Gravitational force (F)
c)
Magnetic force (F)
d)
No force
4.
In which direction do electric field lines point around a negative charge?
a)
Toward the charge
b)
Away from the charge
c)
Perpendicular to the charge
d)
They form a circle
5.
What is the relationship between force and electric field?
a)
F = qE
b)
F = q/E
c)
F = E/q
d)
F = q/E²
6.
What is the electric field created by a single positive charge?
a)
Radially outward
b)
Radially inward
c)
Circular
d)
Tangential
7.
What happens to the electric field strength as you move closer to a charge?
a)
It increases
b)
It decreases
c)
It remains constant
d)
It becomes zero
8.
What is the electric field magnitude for a force of 0.060 N acting on a -2.0 x 10^-8 C charge?
a)
3 x 10^6 N/C
b)
2 x 10^6 N/C
c)
4 x 10^6 N/C
d)
5 x 10^6 N/C
9.
Which of the following is NOT a property of electric field lines?
a)
Field lines can cross each other
b)
Field lines begin on positive charges
c)
Field lines end on negative charges
d)
Field lines never cross
10.
What charge produces an electric field with lines pointing inward?
a)
Negative charge
b)
Positive charge
c)
Neutral charge
d)
All charges
11.
What happens to the force on a positive test charge in a uniform electric field?
a)
It experiences a constant force
b)
It experiences no force
c)
The force decreases
d)
The force increases exponentially
12.
If the charge on a test particle is doubled, what happens to the electric force?
a)
It doubles
b)
It halves
c)
It remains the same
d)
It becomes zero
13.
A positive test charge of 5.0 x 10^-4 C experiences a force of 2.5 x 10^-4 N. What is the electric field magnitude?
a)
0.5 N/C
b)
1.0 N/C
c)
0.25 N/C
d)
2.5 N/C
14.
In which direction is the electric field for a positive test charge in a uniform field?
a)
Same as the force
b)
Opposite to the force
c)
Perpendicular to the force
d)
No specific direction
15.
An oil drop weighs 1.9 x 10^-15 N. It is suspended in an electric field of 6.0 x 10^3 N/C. What is the magnitude of the charge?
a)
3.17 x 10^-19 C
b)
1.0 x 10^-19 C
c)
6.0 x 10^-19 C
d)
9.8 x 10^-19 C
16.
How does the strength of an electric field depend on the distance from a point charge?
a)
Inversely proportional to the square of the distance
b)
Directly proportional to the distance
c)
Inversely proportional to the distance
d)
Constant
17.
What is the direction of the electric field created by two opposite charges?
a)
From positive to negative
b)
From negative to positive
c)
Perpendicular to both charges
d)
No field is created
18.
What happens to the number of field lines as the charge increases?
a)
They increase
b)
They decrease
c)
They remain the same
d)
They vanish
19.
What is the relationship between electric field lines and the surface of a conductor?
a)
Perpendicular
b)
Parallel
c)
Tangential
d)
Circular
20.
What does it mean if the electric field between two charges is zero?
a)
The forces cancel out
b)
The charges are equal
c)
The charges are positive
d)
No charge exists
21.
What is the unit of electric flux?
a)
Nm²/C
b)
N/C
c)
V/m
d)
C/N
22.
What is the formula for electric flux for a uniform electric field?
a)
Φ = EA⊥
b)
Φ = E + A
c)
Φ = E - A⊥
d)
Φ = EA/⊥
23.
Electric flux measures the strength of the electric field passing through which of the following?
a)
A surface
b)
A point charge
c)
A line charge
d)
A circuit
24.
If the electric field and area are perpendicular, what is the electric flux?
a)
Maximum
b)
Zero
c)
Minimum
d)
Undefined
25.
What happens to electric flux if the surface is parallel to the electric field?
a)
Flux is zero
b)
Flux is maximum
c)
Flux is negative
d)
Flux is infinite
26.
In the formula Φ = EAcosθ, what does θ represent?
a)
Angle between the electric field and area vector
b)
Angle between two surfaces
c)
Angle between the charge and surface
d)
No meaning
27.
The electric flux through a surface inclined at 90° to the electric field is:
a)
Zero
b)
Maximum
c)
Infinite
d)
600 N/C
28.
Electric flux is a:
a)
Scalar quantity
b)
Vector quantity
c)
Complex number
d)
Dimensionless quantity
29.
If the electric field is 600 N/C and the area is 10 m², what is the electric flux?
a)
6000 Nm²/C
b)
60 Nm²/C
c)
0 Nm²/C
d)
600 Nm²/C
30.
In which of the following cases is electric flux maximum?
a)
Area is perpendicular to the electric field
b)
Area is parallel to the electric field
c)
Field and area vector form 90°
d)
Field and area vector form 45°
31.
The flux through a surface depends on:
a)
Both electric field and area
b)
Only on the electric field
c)
Only on the area
d)
Neither field nor area
32.
If the electric field increases, what happens to the flux?
a)
It increases
b)
It decreases
c)
It stays the same
d)
It becomes zero
33.
The area vector is always drawn:
a)
Perpendicular to the surface
b)
Parallel to the surface
c)
Tangent to the surface
d)
At an angle of 45° to the surface
34.
Which quantity forms the angle with the area vector in the electric flux formula?
a)
Electric field
b)
Magnetic field
c)
Gravitational field
d)
Pressure field
35.
The electric flux through a flat surface placed at 0° to the electric field is given by:
a)
Φ = EA
b)
Φ = 0
c)
Φ = E/A
d)
Φ = E + A
36.
What is the relation between electric flux and electric field strength?
a)
Directly proportional
b)
Inversely proportional
c)
No relation
d)
Depends on the medium
37.
Electric flux is zero when the surface is:
a)
Parallel to the electric field
b)
Perpendicular to the electric field
c)
At an angle to the electric field
d)
Inside a conductor
38.
Which of the following increases electric flux?
a)
Larger area perpendicular to the electric field
b)
Smaller area parallel to the electric field
c)
Decreasing the electric field
d)
Placing a surface parallel to the electric field
39.
How can we calculate electric flux when the surface area is inclined at an angle θ to the electric field?
a)
Φ = EAcosθ
b)
Φ = EA + θ
c)
Φ = EA/θ
d)
Φ = EθcosA
40.
Electric flux through an area depends on the electric field and:
a)
Perpendicular area component
b)
Charge distribution
c)
Time
d)
None of these
41.
Gauss’s Law relates the net electric flux to which physical quantity?
a)
Enclosed charge
b)
Electric field strength
c)
Area of the surface
d)
Distance from the charge
42.
What is the mathematical expression for Gauss’s Law?
a)
Φ = Qenclosed / ε0
b)
Φ = EAcosθ
c)
Φ = E / r²
d)
Φ = kQ / r²
43.
What is the value of the permittivity of free space (ε0)?
a)
8.85 x 10^-12 C²/Nm²
b)
9 x 10^9 Nm²/C²
c)
1.6 x 10^-19 C
d)
6.63 x 10^-34 Js
44.
The electric flux through a closed surface is zero when:
a)
There is no net charge inside
b)
The electric field is uniform
c)
The surface is a sphere
d)
The surface is large
45.
Which of the following uses spherical symmetry in the application of Gauss’s Law?
a)
Electric field due to a point charge
b)
Electric field due to a line charge
c)
Electric field between two parallel plates
d)
Electric field due to a charged plate
46.
What is the formula for the electric field due to a line charge?
a)
E = λ / (2πε0r)
b)
E = σ / (2ε0)
c)
E = kq / r²
d)
E = Q / A
47.
The electric field due to two parallel charged plates is given by which formula?
a)
E = σ / ε0
b)
E = λ / (2πε0r)
c)
E = kq / r²
d)
E = Q / A
48.
In Gauss’s Law, what is the area vector of a surface?
a)
Perpendicular to the surface
b)
Parallel to the surface
c)
At a certain angle to the surface
d)
Equal to the surface area
49.
What is the charge density symbol used in the formula for the electric field due to a charged plate?
a)
σ
b)
λ
c)
ε0
d)
q
50.
What is the significance of symmetry in the application of Gauss’s Law?
a)
It simplifies calculations of the electric field
b)
It increases the strength of the electric field
c)
It affects the charge distribution
d)
It determines the value of ε0
51.
What is electric potential energy dependent on?
a)
Position of the charge
b)
Type of charge
c)
Temperature
d)
Distance from the ground
52.
What does the formula for electric potential energy (PE) include?
a)
Charge, electric field, distance
b)
Mass, height, gravitational field
c)
Force, acceleration
d)
Voltage, resistance
53.
In the equation PE = qEd, what does "E" represent?
a)
Electric field
b)
Electric potential
c)
Energy
d)
Charge density
54.
If a charge moves against the electric field, what happens to its electric potential energy?
a)
It increases
b)
It decreases
c)
It remains the same
d)
It becomes negative
55.
What is the unit of electric potential energy?
a)
Joules
b)
Newtons
c)
Volts
d)
Coulombs
56.
What is the value of the electric field (E) in the problem if the potential energy at point A is 8x10^-8 J?
a)
10 N/C
b)
4 N/C
c)
2 N/C
d)
8 N/C
57.
If the charge (q) is doubled, what happens to the electric potential energy?
a)
It doubles
b)
It halves
c)
It remains the same
d)
It quadruples
58.
What is the potential energy at point C if a positive charge of 2 nC is placed there with d = 0m?
a)
0 J
b)
8x10^-8 J
c)
4x10^-8 J
d)
2x10^-8 J
59.
In the context of electric potential energy, what does the term "work" refer to?
a)
Energy used
b)
Energy stored
c)
Energy lost
d)
Energy converted
60.
What is the electric potential energy at point B if the distance is 2m?
a)
4x10^-8 J
b)
8x10^-8 J
c)
2x10^-8 J
d)
0 J
61.
What happens to electric potential energy as a charge approaches a positive plate?
a)
It decreases
b)
It increases
c)
It becomes zero
d)
It oscillates
62.
Which of the following is an example of electric potential energy?
a)
A charged battery
b)
A moving car
c)
A compressed spring
d)
A static charge on a balloon
63.
If the electric field (E) is constant, what does the potential energy (PE) depend on?
a)
Charge and distance
b)
Only charge
c)
Only distance
d)
Only electric field
64.
Which formula represents the relationship between work and electric potential energy?
a)
W = Fd
b)
PE = mgh
c)
PE = qEd
d)
F = ma
65.
If a charge moves from point A to point B against the electric field, what does it do?
a)
Does negative work
b)
Does positive work
c)
Does no work
d)
It loses energy
66.
How does the electric potential energy behave for a negative charge near a positive plate?
a)
Increases
b)
Decreases
c)
Remains the same
d)
Becomes positive
67.
What does a larger distance (d) in the formula PE = qEd indicate about potential energy?
a)
It is higher
b)
It is lower
c)
It stays the same
d)
It is negligible
68.
Which factor does not affect electric potential energy?
a)
Charge
b)
Distance
c)
Mass
d)
Electric field
69.
If the electric field strength is halved, what happens to the electric potential energy for the same charge?
a)
It is halved
b)
It is doubled
c)
It remains the same
d)
It becomes zero
70.
What is the effect of an electric field on a charge placed in it?
a)
It experiences force
b)
It does not move
c)
It has no effect
d)
It becomes neutral
71.
What is the purpose of mapping electric field lines in this experiment?
a)
To visualize electric fields
b)
To measure resistance
c)
To increase voltage
d)
To power devices
72.
What is an equipotential line?
a)
A line with the same voltage
b)
A line with varying voltage
c)
A line showing current flow
d)
A line indicating resistance
73.
Which material is used to conduct electricity in the experiment - Mapping Out Electric Field Lines?
a)
Water
b)
Oil
c)
Sand
d)
Air
74.
What instrument is used to measure voltage in the experiment?
a)
Voltmeter
b)
Ammeter
c)
Multimeter
d)
Oscilloscope
75.
Where do electric field lines point?
a)
From positive to negative
b)
From negative to positive
c)
In all directions
d)
Randomly
76.
What does the presence of curved equipotential lines indicate?
a)
Non-uniform electric field
b)
Uniform electric field
c)
High voltage
d)
Low voltage
77.
What happens to the voltage along an equipotential line?
a)
It remains constant
b)
It increases
c)
It decreases
d)
It fluctuates
78.
In the experiment, what connects the nails to the battery?
a)
Alligator clips
b)
Wires
c)
Conductive tape
d)
Metal rods
79.
What is the significance of electric field lines being perpendicular to equipotential lines?
a)
Indicates no work done
b)
Indicates work is done
c)
Shows equal voltage
d)
Represents current
80.
How is water used in the experiment?
a)
As a conductor
b)
As an insulator
c)
As a resistor
d)
As a battery
81.
What should students do after identifying points of the same voltage?
a)
Draw equipotential lines
b)
Disconnect the voltmeter
c)
Change the voltage
d)
Add more water
82.
Which part of the electric field lines shows the direction of force on a positive charge?
a)
The arrows
b)
The line itself
c)
The nails
d)
The water
83.
What is the first step in the procedure for this experiment?
a)
Prepare the graphing paper
b)
Connect the battery
c)
Fill the container with water
d)
Attach the nails
84.
Why might the voltage readings be inconsistent in the experiment?
a)
Water is not a perfect conductor
b)
Faulty equipment
c)
Incorrect setup
d)
Bad connections
85.
What is indicated by the maximum and minimum values of voltage found in the water?
a)
The strength of the electric field
b)
The uniformity of the water
c)
The efficiency of the battery
d)
The resistance of the water
86.
What happens to the electric field lines when voltage is increased?
a)
They become denser
b)
They spread out
c)
They disappear
d)
They turn vertical
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