Charges and Fields Lab
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Jan 9, 2024
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Prof. Satko
PHYS 104B Lab
Electric Charges and Fields
Today, you will use the Charges and Fields PhET lab to map the electric field around one or more point charges.
Here is a link directly to the simulation:
Charges and Fields
.
Alternately, on the CU-Boulder Interactive Simulations (PhET) website, go to the menu on the left side of the
screen.
Click on
Physics
,
then
Electricity, Magnets & Circuits
,
then
Charges and Fields
.
Beginning Observations
1) First, take a few minutes to locate and identify the various features on the program.
2) Check the box that says
Show numbers
.
3)
Add a few charges to the field, then add some E-field sensors. What do the “E-field sensors” show?
Depending on where the E-field sensor is, it shows the direction of the electric field at that spot. It also
shows the voltage per meter and what degree it is at.
4) Select, show E-field. How does the color of the arrow relate to the strength of the field?
5) How can you make a charge of +2 nC?
-3 nC?
You need to put two +1nC charges on top of each other. You do the same thing with the -1nC charges.
Take out 3 of them and place them on top of each other.
Part 1 – Field around isolated point charges
6) Draw the field lines for the scenarios below. Make sure you are sketching
continuous
field lines.
4 nC
-2 nC
Part 2 – Field around two point charges in a line
7) Draw the field lines for the scenarios below. Make sure you are sketching
continuous
field lines.
Two unequal, unlike point charges
Two equal point charges
Place a test e-field sensor anywhere on the screen for both scenarios and draw what you see.
8) When you have two like charges in a line – where is the electric field the greatest? Is there ever a point where
the field will be zero?
9) When you have two unlike charges in a line – where is the electric field the greatest? Is there ever a point
where the field will be zero?
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Related Questions
Use the following information to answer question 14 and Numerical Response 2.
A beam of electrons is incident on a region containing a uniform electric field as shown
below. The electrons in the beam each have a speed of 4.5 x 105 m/s. While in the electric
field the electrons accelerate toward the top plate.
Positively charged plate
- Electron beam
Negatively charged plate
Note: You will want to make your measurements this diagram.
14. Based on your measurements, the strength of the uniform electric field in the region
N/C.
is
10
arrow_forward
You may want to review (Pages 692 - 694).
Part A
What is the potential energy of the electron-proton interactions in (Figure 1)? The electrons are fixed and cannot move. Suppose that r = 0.45 nm and d = 2.5 nm
Express your answer with the appropriate units.
U =
Value
Units
Submit
Request Answer
Provide Feedback
Figure
Proton
Electrons
arrow_forward
Constants
Part A
What is the direction of the electric field at the dot in the figure (Figure 1)?
O down
O to the right
O to the left
O up
Submit
Request Answer
Part B
What is the magnitude of the electric field at the dot?
Express your answer to one significant figure and include the appropriate units.
HA
E =
Value
Units
Submit
Request Answer
Provide Feedback
Next >
Figure
1 of 1>
400 V
1 cm
200 V
1 cm
O V
arrow_forward
Part A
What is the magnitude of the electric field at a point midway between a -8.3 uC and a +5.4 uC charge 9.4 cm apart? Assume no other charges are nearby.
Express your answer using two significant figures.
HÀ
E =
Value
Units
Submit
Request Answer
Part B
What is the direction of the electric field?
toward the positive charge
toward the negative charge
Submit
Request Answer
arrow_forward
Round your final answer with the correct number of significant digits
arrow_forward
Needs Complete typed solution with 100 % accuracy.
arrow_forward
action=onresume&submissionld-507306985
Progressive Test
B.
C.
In the image above, B is at (-5 cm, 0 cm) and represents a negative charge of -0.23C, C is at (8.5 cm, 0 cm) and represents a positive charge of
Assuming there are no other charges present, what electric field would we measure at A (0 cm, 7 cm)?
主
面
t Upload files
Supported file formats: PDF, JPG, GIF, PNG, CSV. RTF, TXT, XPS, ZIP, Word, Excel, Powerpoint, Publisher, Open Office,
Video, MATLAB. ANera Quartus, Verilog, C. H, S. V. CPP, Assembly
0/1 File Limit
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Two 3.0 g spheres on 1.0-m-long threads repel each
other after being equally charged, as shown in (Figure 1).
Figure
3.0 g
My Research Fo.
1.0 m/20° 20° 1.0 m
9
1 of 1
3.0 g
Part A
What is the charge q?
Express your answer in nanocoulombs.
q=
[15] ΑΣΦ
Submit
Request Answer
< Return to Assignment
Provide Feedback
?
nC
arrow_forward
according to this data table , can you write the analysis ? (electroscope )Essay format
use your data to explain the relative charges on each of the rods. You will have 4 answers. I suggest
arbitrary labeling the PVC rod when rubbed with cotton as "charge A", then labelling the others as
either Á (same charge) or charge B (opposite charge).
N:B we cannot know for sure if the charges are positive or negative, all we know is that something is
Charge type A and another thing charge type B, we know these charge types are different, but we do
not know which is positive or negative
Wool
Cotton
Nylon
A
B
PVC
A
B
arrow_forward
I need to answer of 6th question
arrow_forward
answer 2
arrow_forward
OneNote for Windows 10
Shahid Iqbal
Home
Insert
Draw
View
Help
Class Notebook
A Share
6 O Shapes G Ink to Shape
a Ink to Text
A Ruler
최늘 Math
Extra credit Problem
A parallel-plate capacitor with a capacitance of 200 pF is
charged to 100 V. Then the battery is removed. A sheet of
teflon (K = 2.0) is then slid between the plates.
A. By what factor does the charge on the plates change?
B. What is the final potential difference between the plates?
2:27 PM
2/15/2021
J
A A
ALBION
You
14 others
arrow_forward
Capacitance: A Review
Learning Goal:
To review the meaning of capacitance and ways of changing the capacitance of
a parallel-plate capacitor.
Capacitance is one of the central concepts in electrostatics. Understanding its
meaning and the difference between its definition and the ways of calculating
capacitance can be challenging at first. This tutorial is meant to help you
become more comfortable with capacitance. Recall the fundamental formula for
capacitance:
C=Q/AVC.
where C is the capacitance in farads, Q is the charge stored on the plates in
coulombs, and AVC is the potential difference (or voltage) between the plates.
In the following problems it may help to keep in mind that the voltage is related
to the strength of the electric field E and the distance between the plates, d, by
AVc = Ed.
What property of objects is best measured by their capacitance?
the ability to conduct electric current
the ability to distort an external electrostatic field
O the ability to store charge…
arrow_forward
Please show calculation for one problem
arrow_forward
Setung up the solution to a basic quantitative problem
The electric field strength between the plates of a simple air capacitor is equal to the voltage across the plates divided by the distance between them. When a
voltage of 71.4 V is put across the plates of such a capacitor an electric field strength of 1.3
kV
is measured.
cm
Write an equation that will let you calculate the distance d between the plates. Your equation should contain only symbols. Be sure you define each symbol.
Your equation:
arrow_forward
Complete the table. Calculate the electric field using the given formula. Kindly provide solution. Thank you.
arrow_forward
Positive charge Q is distributed uniformly along the positive y-axis between y = 0 and y = a. A negative pointcharge -q lies on the positive x-axis, a distance x from the origin as shown in the figure below.
1.) What is dEₓ?
2.) What is dEy?
3.) What is Ex evaluated from 0 - a?
4.)
arrow_forward
Please give me answers in 5min I will give you like sure
arrow_forward
8.
arrow_forward
What conclusion can we get on the attached figure below? *
Y
.metal
plates
The upper plate is positive and the lower plate is negative.
A proton at X experiences less force than if it were placed at Z.
A proton at X experiences a greater force than if it were placed at Z.
A proton at X would experience the same force if it were placed at Y.
An electron at X could have its weight balanced by the electrical force.
arrow_forward
I don't understand why this is the correct graph, particularly why the electric field strength is negative between the charges. Can you please explain?
arrow_forward
Coulomb Force
Open the simulation
https://phet.colorado.edu/sims/html/coulombs-law/latest/coulombs-law_en.html
Select the Macro Scale option. Check the box to show the Force values (on the right side).
Select two charge values to analyze and record below, the exact values are not as important as we will be investigating the dependence of the Electric Force on the separation (r) between the charges.
Move charge 1 (q1) so that its center is located at 0 cm. You can move the ruler to make sure the center is at zero. Move charge 2 (q2) so that its center is at the 2 cm mark.
Record the magnitude of the force between the particles in the table below.
Move q2 so its center is at the next separation listed. Repeat your measures of Force for the separations listed in the table below, making sure the center of the charge is at the appropriate location.
q1 = ______________________ q2 = _________________________
Separation, r (meters)
Force (Newtons)
0.02…
arrow_forward
In an experiment you observed the attraction of a charged object to the wall. It correctly depicts the microscopic level mechanism for this observation. Identify the correct statements that apply when the object is negatively charged.
PLEASE SELECT ALL THAT APPLY
arrow_forward
I Review
Two 2,5 cm-diameter disks face each other,
1.5 mm apart. They are charged to + 19 nC.
Part A
What is the electric field strength between the disks?
Express your answer with the appropriate units.
• View Available Hint(s)
?
E =
Value
Units
Submit
Part B
A proton is shot from the negative disk toward the positive disk. What launch speed must the proton have to just
barely reach the positive disk?
Express your answer with the appropriate units.
• View Available Hint(s)
arrow_forward
SEE MORE QUESTIONS
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Related Questions
- Use the following information to answer question 14 and Numerical Response 2. A beam of electrons is incident on a region containing a uniform electric field as shown below. The electrons in the beam each have a speed of 4.5 x 105 m/s. While in the electric field the electrons accelerate toward the top plate. Positively charged plate - Electron beam Negatively charged plate Note: You will want to make your measurements this diagram. 14. Based on your measurements, the strength of the uniform electric field in the region N/C. is 10arrow_forwardYou may want to review (Pages 692 - 694). Part A What is the potential energy of the electron-proton interactions in (Figure 1)? The electrons are fixed and cannot move. Suppose that r = 0.45 nm and d = 2.5 nm Express your answer with the appropriate units. U = Value Units Submit Request Answer Provide Feedback Figure Proton Electronsarrow_forwardConstants Part A What is the direction of the electric field at the dot in the figure (Figure 1)? O down O to the right O to the left O up Submit Request Answer Part B What is the magnitude of the electric field at the dot? Express your answer to one significant figure and include the appropriate units. HA E = Value Units Submit Request Answer Provide Feedback Next > Figure 1 of 1> 400 V 1 cm 200 V 1 cm O Varrow_forward
- Part A What is the magnitude of the electric field at a point midway between a -8.3 uC and a +5.4 uC charge 9.4 cm apart? Assume no other charges are nearby. Express your answer using two significant figures. HÀ E = Value Units Submit Request Answer Part B What is the direction of the electric field? toward the positive charge toward the negative charge Submit Request Answerarrow_forwardRound your final answer with the correct number of significant digitsarrow_forwardNeeds Complete typed solution with 100 % accuracy.arrow_forward
- action=onresume&submissionld-507306985 Progressive Test B. C. In the image above, B is at (-5 cm, 0 cm) and represents a negative charge of -0.23C, C is at (8.5 cm, 0 cm) and represents a positive charge of Assuming there are no other charges present, what electric field would we measure at A (0 cm, 7 cm)? 主 面 t Upload files Supported file formats: PDF, JPG, GIF, PNG, CSV. RTF, TXT, XPS, ZIP, Word, Excel, Powerpoint, Publisher, Open Office, Video, MATLAB. ANera Quartus, Verilog, C. H, S. V. CPP, Assembly 0/1 File Limitarrow_forwardTwo 3.0 g spheres on 1.0-m-long threads repel each other after being equally charged, as shown in (Figure 1). Figure 3.0 g My Research Fo. 1.0 m/20° 20° 1.0 m 9 1 of 1 3.0 g Part A What is the charge q? Express your answer in nanocoulombs. q= [15] ΑΣΦ Submit Request Answer < Return to Assignment Provide Feedback ? nCarrow_forwardaccording to this data table , can you write the analysis ? (electroscope )Essay format use your data to explain the relative charges on each of the rods. You will have 4 answers. I suggest arbitrary labeling the PVC rod when rubbed with cotton as "charge A", then labelling the others as either Á (same charge) or charge B (opposite charge). N:B we cannot know for sure if the charges are positive or negative, all we know is that something is Charge type A and another thing charge type B, we know these charge types are different, but we do not know which is positive or negative Wool Cotton Nylon A B PVC A Barrow_forward
- I need to answer of 6th questionarrow_forwardanswer 2arrow_forwardOneNote for Windows 10 Shahid Iqbal Home Insert Draw View Help Class Notebook A Share 6 O Shapes G Ink to Shape a Ink to Text A Ruler 최늘 Math Extra credit Problem A parallel-plate capacitor with a capacitance of 200 pF is charged to 100 V. Then the battery is removed. A sheet of teflon (K = 2.0) is then slid between the plates. A. By what factor does the charge on the plates change? B. What is the final potential difference between the plates? 2:27 PM 2/15/2021 J A A ALBION You 14 othersarrow_forward
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