Physics - Electromagnetism
Lab : Electric Charge and Electric Interactions
(attached in below)
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Lab #: Lab Title (from the lab handout)
Author: Your Full Name
Date Performed: Month, Day, Year
Class: PHYS ###
Section: #####
Group Members:
Full Name of Member 1
Full Name of Member 2
Full Name of Member 3
Full Name of Member 4
Abstract
The abstract is one paragraph describing the ultimate purpose, methods used, and results of the lab
work. From the abstract, the reader should be able to understand what the lab is intended to measure,
what significant measurements were taken, and what summary results (including numbers) were
obtained. It is not a detailed description, but a terse overview. Essentially you are to sum up the whole
lab in one paragraph in this section. The abstract is not about anticipated activities, but an account of
the experiments after they have been conducted.
Theory
This section of the report provides the theoretical context of the lab. Include theory that is relevant to
the understanding of the lab experiments and the interpretation of the data. This section should look
like a short encyclopedia entry on the topic of the lab and should include all the relevant equations
(properly formatted). Use the textbook and other references to learn about the theory needed for the
interpretation of your experimental results. Do not copy from the references or the handout; write in
your own words instead.
Do not provide a list of procedures that you followed and do not mention the results of the lab work or
show calculations in this section. This is also not the place to include your thoughts about the lab or the
results you obtained.
Measurements and Observations
This section includes a thorough description of the experimental setup(s), procedures followed, and the
raw data (quantitative and qualitative) obtained from measurement and observation.
Diagrams/snapshots of the experimental setup(s) should be included here. Do not include too many
diagrams/snapshots; be judicious in your choices. Numerical data should be presented in tabular form
when appropriate. Tables should not be broken over multiple pages.
Data Analysis and Discussion
All calculations related to the data and conclusions drawn from it should be outlined here, including
calculations of percentage errors. For similar calculations, only include sample calculations. When
appropriate or requested in the lab handout, include graphs of the data in this section. For all graphs,
make sure you include titles, labeled axes with units, and the equations of curve-fits if they are used.
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In addition to the quantitative conclusions, also include a discussion regarding the nature and the
significance of the results obtained. What were your fundamental conclusions from the lab
experiment(s)? Were there any surprises or were the results as expected from theory? If the lab did not
work out as it seems it should have, this is the place to discuss it. Why do you think it did not work out?
What were the causes? How might you avoid the same problems in the future? When addressing these
questions, do not simply provide one-sentence answers like “There were no surprises.” A thorough
discussion is expected here.
The report must follow the above format and must be written in your own words, in complete
sentences, and in paragraph form (not in list form). The report must be self-contained. This means that
it should contain a thorough account of the experimental setup without need to refer to the lab
handout. The lab report should also not read as if it is answering questions asked somewhere else. Do
not copy from the lab handout and do not quote references. Write in your own words instead. Do not
write the lab report as if you were asked (or forced) to carry out the lab activities. Use “we” instead of
“I”. Do not use “student” or “students” to refer to yourself or your lab partners.
Each section should contain multiple paragraphs of relevant content (except for the abstract which
needs to be one paragraph). Avoid repetition and copying and pasting from one section into another.
When including tables, graphs, and other figures, also include explanatory text to accompany these
elements. Do not group tables, graphs, and other figures together; they should be integrated with the
text and included where they need to be included.
Also pay close attention to the formatting of the lab report, including typography, margins, spacing, and
overall look. Finally, make sure the report is free of typos and grammatical errors.
The lab report must be submitted on Canvas as one Word document (integrating all the tables, graphs,
and other figures). As a SAC student, you have free access to Microsoft Office 365, which includes Word
and Excel.
The lab reports will be graded using a rubric. Make sure you read the rubric carefully for any additional
requirements.
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Lab 1: Electric Charge and Electric Interactions
Objectives
In this lab you will use PhET’s simulations Balloons and Static Electricity, John Travoltage, and
Coulomb's Law to study interactions between electric charges.
Part 1: Balloons and Static Electricity
Open the Balloons and Static Electricity simulation.
1. Select the option “Show all charges”.
2. Look at the balloon. What can you say about its net charge?
3. Click and drag the balloon and rub it against the sweater. What happens to the balloon?
How did the balloon get charged, with what type of charge? Where did that charge come
from?
4. What happened to the sweater? How did it get charged? Where did that charge come from?
5. Bring the balloon to the middle, between the sweater and the wall. What happens to the
balloon when you let it go? Explain the reason behind the observed phenomenon.
6. What is the overall charge of the wall? What do you expect will happen when the balloon is
brought close to the wall? Make a prediction.
7. Bring the balloon in contact with the wall. What happens to the charges in the wall? Let go
of the balloon. What happens? Explain the reason behind the observed phenomenon.
Part 2: John Travoltage
Open the John Travoltage simulation.
1. Predict what will happen to John if he rubs his foot against the carpet.
2. Rub John’s foot on the carpet by clicking and dragging his foot several times. What happens?
3. Predict what will happen if John touches the doorknob.
4. Click and drag John’s hand to touch the doorknob. What happens? Explain the reason
behind the observed phenomenon.
Part 3: The Electrostatic Force – Dependence on Charge
In this part use the Coulomb's Law simulation. Select the Macro Scale simulation.
1. Check the box to display Force Values.
2. Set the distance between the charges to 2 cm and set Charge 1 to 2 μC.
3. Change Charge 2 (only) and record the magnitude of the corresponding electrostatic force.
4. Complete the following table:
https://phet.colorado.edu/sims/html/balloons-and-static-electricity/latest/balloons-and-static-electricity_en.html
https://phet.colorado.edu/sims/html/john-travoltage/latest/john-travoltage_en.html
https://phet.colorado.edu/sims/html/coulombs-law/latest/coulombs-law_en.html
https://phet.colorado.edu/sims/html/balloons-and-static-electricity/latest/balloons-and-static-electricity_en.html
https://phet.colorado.edu/sims/html/john-travoltage/latest/john-travoltage_en.html
https://phet.colorado.edu/sims/html/coulombs-law/latest/coulombs-law_en.html
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𝑞2 (μC) −10 −8 −6 −4 −2 0 2 4 6 8 10
𝐹𝑒 (N)
5. Make a scatter plot of 𝐹𝑒 versus 𝑞2. Plot 𝐹𝑒 along the vertical axis and 𝑞2 along the horizontal
direction.
6. Are your results consistent with Coulomb’s law?
Part 4: The Electrostatic Force – Dependence on Distance
In this part continue using the Coulomb's Law (Macro Scale) simulation.
1. Check the box to display Force Values.
2. Set each charge to 10 μC.
3. Change the distance between the charges (only) and record the magnitude of the
corresponding electrostatic force.
4. Complete the following table:
𝑟 (cm) 2 3 4 5 6 7 8 9 10
𝐹𝑒 (N)
5. Make a scatter plot of 𝐹𝑒 versus 𝑟. Plot 𝐹𝑒 along the vertical axis and 𝑟 along the horizontal
direction. Include the best-fit curve in your graph and the equation of the best-fit curve.
Decide the type of curve to fit the data with based on Coulomb’s law.
https://phet.colorado.edu/sims/html/coulombs-law/latest/coulombs-law_en.html
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