ANS Lab 02_Charge_Force_Field_v1
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Lab 02: Charges, Electric Force and Electric Field
You will need to run a simulation to do the lab. Answer the following questions as you work
through
the lab
. Write your answers in blue
.
Re-load the file in Word or PDF format in Moodle
before the due date.
Lab Objective:
1.
Learn how electric charges interact with an external electric field. 2.
Understand the vector nature of electric force between charges and an external electric field. Material:
Stop watch
(e.g. you can use your smartphone for this). Introduction:
The electric force acting on a charge q
in an external electric field E
is given by the relation 𝑭
!"
=𝑞𝑬
. The stronger the external field, the larger the electric force. Also, a large charge can experience a large force in a weak electric field. In this lab, you will simulate the force acting on a charged particle in an external electric field. This lab is mostly qualitative. Simulation:
Open the Electric Field of Dreams
simulation in the PhET.colorado.edu website. https://phet.colorado.edu/en/simulation/efield
Take a few minutes to become familiar with the simulation. Click all the buttons, check the “properties” of your charge. Change the values of mass and charge. Change the size and direction of the “external electric field” by dragging the blue dot (see figure below). For the simulations below, set the length of the electric field vector to about 1cm (see figure below), unless stated otherwise. 1a.
Force on a positive charge:
Simula’on created by the Physics Educa’on Technology Project (PhET) c/o The University of Colorado at Boulder
hAp://phet.colorado.edu/
Change this
i.
Click on the Properties
button. Set the charge to 0.10 and the mass to 10. Click on the Add
button. You should see a blue charge moving under the influence of the external electric field. Pause the motion of the charge and drag it to the middle of the box. “Play” the simulation again. Q1:
Which direction does the charge move? a
. Along the direction of 𝑬
b.
Opposite of the direction of 𝑬
a. right b. left Q2
: What is the direction of electric force 𝑭
? a
. Along the direction of 𝑬
b.
Opposite of the direction of 𝑬
a. right b. ii.
Set the direction of the electric field so that it points to the right
. Q3:
What direction does the charge move? right iii.
Set the electric field, 𝑬
in different direction and fill out the table below. Try to keep the magnitude of 𝑬
constant. Keep the mass at 10. Start the charge at a location that will allow for maximum travel. All observations should be made on the motion before
the first bounce on the wall.
Charge Direction of 𝑬
Direction of
motion Direction of 𝑭
Describe the motion 0.1 Right
Right
Moves
to
the
right
in
uniform
motion
0.1 up
Up
Moves
up
in
uniform motion
0.1 Left
Left
Moves
to
the
left
in
uniform
motion
0.1 Down
Down
Moves
to
the
down
in
uniform
motion
1.0 Right
right
Moves
to
quickly to
the
right
due
to
increase in
charge
magnitude
Simula’on created by the Physics Educa’on Technology Project (PhET) c/o The University of Colorado at Boulder
hAp://phet.colorado.edu/
5.0 Right
Right
Moves
even
more
quickly to
the
right
due
to
increase in
charge
magnitude
10.0 Right
Right
Second fastest
overall
movement
to
the
right
due
to
increase in
charge
magnitude
20.0 Right
Right
Fastest
overall
movement
to
the
right
due
to
increase in
charge
magnitude
1b.
Force on a negative charge:
iv.
Click on the Properties
button. Set the charge to -0.10 and the mass to 10. Repeat similar steps used in part 1a. Q4:
Which direction does the charge move? a
. Along the direction of 𝑬
b.
Opposite of the direction of 𝑬
Q5
: What is the direction of electric force 𝑭
? a
. Along the direction of 𝑬
b.
Opposite of the direction of 𝑬
i.
Set the direction of the electric field so that it points to the right
. Q6:
What direction does the charge move? Left ii.
Set the direction of the electric field, 𝑬
in different direction and fill out the table below. Try to keep the magnitude of 𝑬
constant. Keep the mass at 10. Charge Direction of 𝑬
Direction of
motion Direction of 𝑭
Describe the motion -0.1 left
left
Moves
slowly
in
the
oppositedirection
of
the
e-@ield
and
electric force
-0.1 Down
Down
Moves
slowly
in
the
oppositedirection
of
the
e-@ield
and
electric force
Simula’on created by the Physics Educa’on Technology Project (PhET) c/o The University of Colorado at Boulder
hAp://phet.colorado.edu/
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Related Questions
The electric field between two square metal plates is 150 N/C. The
plates are 1.9 m on a side and are separated by 4.8 cm , as in the figure
(Figure 1).
Part A
What is the charge on each plate? Neglect edge effects.
Express your answer using two significant figures.
nC
Submit
Request Answer
Figure
1 of 1
Provide Feedback
arrow_forward
1. Find the magnitude and direction of the electric field at the point (a, a), produced by the 3 charges located at the
vertices of a square of side a, as shown in the figure.
2. Represent again the electric field but now using a unit vector.
The deliverable must include:
The formulas used
The free body force diagram
Complete procedures
Express the force in vector notation.
Also express the force in magnitude and direction format
Use the correct physical units
y
+q
+q
a
Ē(a, a) = ?
+q
X
arrow_forward
1.How do you determine the electric force F experienced by a test charge +q in the presence of an electric field E?
2. Now, suppose the charge in No. 1 is made to move at constant velocity from point A to point B against the direction of E. Determine the magnitude of the force F2 that must be applied to carry this out.
3. Write down the expression for the infinitesimal work done in moving the charge +q from point A to some other displacement towards point B at constant velocity against E.
arrow_forward
3. A positive charge of magnitude q, is shown
at the right. Points B and C are a distance ro
from the charge and point A is a distance 2r.
from it. Let WAB represent the work done by an
external agent in moving a small test charge from
point A to point B.
a. Use an arrow to indicate the direction of the
electric field at points A, B, and C.
X
A
X
B
X
C
qo
b. Would the absolute value of the work done by an external agent in moving the
same test charge from point B to point C be greater than, less than, or equal
to WAB? Explain.
c. Would the absolute value of the work done by an external agent in moving the
same test charge from point A to point C be greater than, less than, or equal
to WAB? Explain.
arrow_forward
7. Pull the required charges to obtain the arrangements shown below (one at the time).
Use the superposition principle and:
a. Draw the net electric field at the position of the E-field sensor.
b. Write an expression for the net electric field at the position of the E-field sensor
(show all your work).
c. Find the magnitude and direction of the net electric field at the position of the
E-field sensor (click on "show numbers" and verify your answers
Note all charges are fixed at the grid, and 1 box = 0.1 m.
arrow_forward
8. Pull the required charges to obtain the arrangements shown below (one at the time).
Use the superposition principle and:
a. Draw the net electric field at the position of the E-field sensor.
b. Write an expression for the net electric field at the position of the E-field sensor
(show all your work).
c. Find the magnitude and direction of the net electric field at the position of the
E-field sensor (click on "show numbers" and verify your answers
Note all charges are fixed at the grid, and 1 box = 0.1 m.
Lab I: Charges & Fields
arrow_forward
An electric field É = (1.7×105 N/C, right ) causes the 5.0 g ball in
(Figure 1) to hang at a 20° angle.
Part A
What is the charge on the ball?
Express your answer in nanocoulombs.
να ΑΣφ
nC
Submit
Request Answer
Provide Feedback
Figure
20°
5.0 g
arrow_forward
Learning Task 3: Problem Solving
Directions: Read and analyze the problems below. Solve for what is asked. Make
sure to follow G-A-S format shown in the previous examples.
1. Calculate the electric field strength from a 1.25x10-8C charge if the test
charge is placed 2.50x10-Sm.
arrow_forward
Description
Solve the following problems. Show your complete solution. You can answer it through a paper, take a
photo and send here, or you can answer using MS Word equation option and send the file.
1. A +2nC charge is in a 200ON/C electric field. Find the electrostatic force on the charge.
arrow_forward
Please explain the phenomenon in paragraph form using these guide questions.
Reminder: Your answer will consist of one to two whole paragraphs and do not answer the following questions one at a time since these are only GUIDE questions.
a. Explain the two possible scenarios wherein the negative test charge moves in the opposite direction of the horizontal electric field.
2. For each scenario in letter a, if there is one positive linear charge and one negative linear charge included in the system, locate whether the positive and the negative linear charges are at the left or at the right side of the
horizontal electric field.
3. Is the movement of the negative test charge in accordance to its natural response when it enters the electric field or not? Meaning, is the negative test charge goes to the positive linear charge and away from
the negative charge or does it have an opposite reaction?
arrow_forward
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
B. Practice Task 2. Using the Triboelectric Series, predict the charges of each object in the descriptions
below.
1. a rubber balloon rubbed against human hair
2. a glass rod is rubbed with wool
3. polypropylene book cover rubbed against pieces of paper
arrow_forward
EL1: Some electronic devices are easily damaged if they are covered in excess charge.
Imagine you have a box full of these devices. Left as is, they can get jostled and
accumulate excess charge.
Sketch a picture showing how you would store these devices so that they would be safe
from excess charges (include any charges or electric field vectors you think are
important to describe how it works). Explain how your system protects them, using
reasoning from what you’ve learned in class.
arrow_forward
3. Use the following diagram to answer the following:
a. What is the work done by the electric force to
move a 5 C charge from A to B?
-2V
PA
-4V
b. What is the work done to move the 5 C charge from B to C?
C. On the diagram draw the Electric Field vector at point D.
d. If you release a proton from rest at position D and it follows a path that takes it through
position A, what will be the kinetic energy of the proton at position A?
arrow_forward
Directions: Solve for the given problems. Show your complete solutions. Round off your answers into 3 significant figures.
2. A negatively-charged oil drop weighs 9.0 x 10-15 N. The drop is suspended in an electric field of 6.0 x 103 N/C.a. What is the charge on the oil drop?b. How many electrons does it carry?
arrow_forward
A dust particle has an excess electrical charge of -5.5 μC and a mass of (1* 10^-5 kg) The dust particle is suspended at rest at a distance of 5 cm above a small electrically charged plate.
a. sketch situation
b. draw a fore diagram for the dust particle
c. determine the electrical charge of the plate
d. Does the answer make sense? How do you know
arrow_forward
Use the diagram to answer the following questions.
a. State the nature of the charge X and charge Y.
b. Using the field diagram state which object, X or Y, had a higher magnitude of charge. Explain your reasoning.
arrow_forward
A protein molecule in an electrophoresis gel has a negative charge.
The exact charge depends on the pH of the solution, but 30 excess
electrons is typical.
Part A
What is the magnitude of the electric force on a protein with this charge in a 1600 N/C electric field?
Express your answer in newtons.
F =
N
Submit
Request Answer
Provide Feedback
arrow_forward
Directions: Solve for the given problems. Show your complete solutions. Round off your answers into 3 significant figures.
3. How far from a -6.4-µC point charge must a 1.8-µC point charge be placed for the electric potential energy to be equal to -0.350 J?
4. 1. A sphere centered at the origin has a radius of 0.200 m. A -4.20-µC charge is on the x-axis at x = 0.500 m. The net flux through the sphere is 400 N·m2/C. Calculate the total charge inside the sphere.
arrow_forward
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- The electric field between two square metal plates is 150 N/C. The plates are 1.9 m on a side and are separated by 4.8 cm , as in the figure (Figure 1). Part A What is the charge on each plate? Neglect edge effects. Express your answer using two significant figures. nC Submit Request Answer Figure 1 of 1 Provide Feedbackarrow_forward1. Find the magnitude and direction of the electric field at the point (a, a), produced by the 3 charges located at the vertices of a square of side a, as shown in the figure. 2. Represent again the electric field but now using a unit vector. The deliverable must include: The formulas used The free body force diagram Complete procedures Express the force in vector notation. Also express the force in magnitude and direction format Use the correct physical units y +q +q a Ē(a, a) = ? +q Xarrow_forward1.How do you determine the electric force F experienced by a test charge +q in the presence of an electric field E? 2. Now, suppose the charge in No. 1 is made to move at constant velocity from point A to point B against the direction of E. Determine the magnitude of the force F2 that must be applied to carry this out. 3. Write down the expression for the infinitesimal work done in moving the charge +q from point A to some other displacement towards point B at constant velocity against E.arrow_forward
- 3. A positive charge of magnitude q, is shown at the right. Points B and C are a distance ro from the charge and point A is a distance 2r. from it. Let WAB represent the work done by an external agent in moving a small test charge from point A to point B. a. Use an arrow to indicate the direction of the electric field at points A, B, and C. X A X B X C qo b. Would the absolute value of the work done by an external agent in moving the same test charge from point B to point C be greater than, less than, or equal to WAB? Explain. c. Would the absolute value of the work done by an external agent in moving the same test charge from point A to point C be greater than, less than, or equal to WAB? Explain.arrow_forward7. Pull the required charges to obtain the arrangements shown below (one at the time). Use the superposition principle and: a. Draw the net electric field at the position of the E-field sensor. b. Write an expression for the net electric field at the position of the E-field sensor (show all your work). c. Find the magnitude and direction of the net electric field at the position of the E-field sensor (click on "show numbers" and verify your answers Note all charges are fixed at the grid, and 1 box = 0.1 m.arrow_forward8. Pull the required charges to obtain the arrangements shown below (one at the time). Use the superposition principle and: a. Draw the net electric field at the position of the E-field sensor. b. Write an expression for the net electric field at the position of the E-field sensor (show all your work). c. Find the magnitude and direction of the net electric field at the position of the E-field sensor (click on "show numbers" and verify your answers Note all charges are fixed at the grid, and 1 box = 0.1 m. Lab I: Charges & Fieldsarrow_forward
- An electric field É = (1.7×105 N/C, right ) causes the 5.0 g ball in (Figure 1) to hang at a 20° angle. Part A What is the charge on the ball? Express your answer in nanocoulombs. να ΑΣφ nC Submit Request Answer Provide Feedback Figure 20° 5.0 garrow_forwardLearning Task 3: Problem Solving Directions: Read and analyze the problems below. Solve for what is asked. Make sure to follow G-A-S format shown in the previous examples. 1. Calculate the electric field strength from a 1.25x10-8C charge if the test charge is placed 2.50x10-Sm.arrow_forwardDescription Solve the following problems. Show your complete solution. You can answer it through a paper, take a photo and send here, or you can answer using MS Word equation option and send the file. 1. A +2nC charge is in a 200ON/C electric field. Find the electrostatic force on the charge.arrow_forward
- Please explain the phenomenon in paragraph form using these guide questions. Reminder: Your answer will consist of one to two whole paragraphs and do not answer the following questions one at a time since these are only GUIDE questions. a. Explain the two possible scenarios wherein the negative test charge moves in the opposite direction of the horizontal electric field. 2. For each scenario in letter a, if there is one positive linear charge and one negative linear charge included in the system, locate whether the positive and the negative linear charges are at the left or at the right side of the horizontal electric field. 3. Is the movement of the negative test charge in accordance to its natural response when it enters the electric field or not? Meaning, is the negative test charge goes to the positive linear charge and away from the negative charge or does it have an opposite reaction?arrow_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_forwardB. Practice Task 2. Using the Triboelectric Series, predict the charges of each object in the descriptions below. 1. a rubber balloon rubbed against human hair 2. a glass rod is rubbed with wool 3. polypropylene book cover rubbed against pieces of paperarrow_forward
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