Hey I need help with this lab, this is our first lab and I don't know how to make it.

This is not a big lab just a lot of explanations, thank you!

Ch. 16 Lab This lab requires you to use the simulation found here: ht_tps:ffphetcolorado.edu/enfsimulationfcharges-and-elds This simulation allows you to place both positive and/or negative charges and then allows you to place a \"test\" charge so that you can determine the strength of the electric field at various positions relative to the initial charge. Sensors In the image above the red charge is the charge that is creating the electric field and electric potential and the little yellow charge is the "test\" charge. I will be talking a lot of the test charge in these instructions. The test charge is funny because technically it is a charged object, but the magnitude of the test charge is considered to be so small, that the yellow charge does NOT create its own electric field, or at least its own electric field is negligible compared to the other charges in the area. This is similar to the gravitational field we are all experiencing. Technically a person standing on the Earth does create a gravitational field because that person does have mass. However, the gravitational field due to the Earth is so much greater, than that of the person, and therefore the gravitational field due to the person is so small it is negligible. This has all been covered in the video lectures, so be sure to watch those first. The same thing is going on here. The little yellow "test\" charge feels the effects of the electric field due to the red (positive) or blue (negative) charge because there would be a force on a charge where the little yellow charge is at, but the size of the field is not affected by the test charge itself. The electric field due to the red or blue charge can be expressed as follows: Point charge (ll The Q in the equation above is the magnitude of the red or blue charge, NOT the test charge (yellow). This is measured in nanocoulombs in the simulator. You will need to convert to Coulombs. 1 C = 1x10"9 [1; So, 5 [1g is also 5 xlo-Q C The symbol r is the distance from the red charge to the place where the test charge is. Make sure that this is expressed in meters. E is the strength of the electric field which could be expressed in Wm which is equivalent to MC. The simulation gives you the value of the electric field strength as you can see below as 23.9 Wm which is the same as 23.9 N/C. So, remember that a good physics experiment uses data to verify a physics principle (equation). You can use this simulation to measure the distance from the test charge to the red charge (or blue) and you can measure the strength of the electric field at that distance. Remember that the red or blue chare is called the source charge and the yellow charge is called the test charge. The little measuring tape is shown below. You simply drag the measuring tape from the right side of the simulation to make that measurement. The value is given right under the measuring tape in centimeters. You will need to convert to m = 100 cm So, you can measure E and r, and Q using the simulation. Now as I have previously stated, one of the best ways to verify a physics principle or equation is to graph the variables that you can measure and use the slope of the graph from your data to compare to some constant in the physics equation. That is what we will do in this experiment. What I want you to do is to use the value of E, r, and Qto determine an experimental value for k or Coulomb's constant. Illll'l'; If dd an ->-> \"'3! NW N's \\'N You will need to start by choosing a number of red (let's stick with red) charges to put in the middle of the simulation. If you choose 5 of the to put on top of each other, then the source charge would be 5 ggor 5 x10\"-9 C. Make sure that you record the value for the source charge somewhere in your data table. It becomes important later. You can click on show values and you can see the magnitude of the electric field @ Wm in the image above) wherever you place the yellow test charge. You can use the little ruler to measure the distance from the charge to the point where you are measuring the electric fields strength which is 66.2 cm (Mm) in the image above. So, the image above represents one data point. In the equation E = k * O/rAZ Just like Y=m*x g can be your y value or dependent values. This will change whenever you move the test charge (yellow) closer or further away from the source chargels). (Q/rAZ) can be your x values or independent values. You would agree that these are the values that you can change either by changing the magnitude of the red charge (by placing more red charges on top of each other) or the distance to the charge that you are measuring the field stretch. I would keep the magnitude of the source charges the same but move the distance each time you measure the electric field strength. That means that the slope of your graph of E vs. (Q/rAZ) should be equal to k, or Coulombs constantjhout 8.99x10"9N*m'\\2/C'\\2. Now, measure 4 or so more data points and calculate a new (0/rA2) for each data point. It is really just going to be the value for r that you are changing, but you are calculating OjrAZ. Each time you make a new data point take a screen shot like the one that is provided above and post it in your data section. Also remember to create a data table showing all your data including units. Also show at least one sample calculation for how you calculated Q/rAZ sol can give you feedback on mistakes you may have made. Remember to include units with ALL values. Create a scatter plot graph of E vs. (OjrAZ). Please read the information below regarding graphs. Graphs. Several of the labs that we do in this course require a scatter plot graph to be created and turned in. Excel will be used for this task. Graphs done by hand will not be accepted. Many ofthe labs will not receive a passing grade without being able to create a scatterplot using excel. A graph must have the following properties to be given full credit. 1) The graph itself and the axis must be titled, with units given. 2) Major and minor gridlines should be shown. 3) The equation of best t should be shown with physics symbols and units with any values (not the equation y=m. Here is an example of an acceptable graph: ' 2 Time vs me 1.6 1.2 0.8 T2 {sec2} 0.6 0.4 0.2 0 0.02 0.04 0.06 0.08 0.1 0.12 me\" {kg} T2 = (12.554sec27'kglm + 0.05648ec2 Here is video that I made showing how to create a scatter plot using excel: htt : www.5creencast.com t szb u7tax Be sure to show the equation of best fit for this graph. If you don't get a straight line, you calculated something wrong as this is a linear/direct relationship. If E is really directly proportional to (Q/ri'Z) then according to the equation we are trying to prove, the slope of your data should equal Coulombs constant or k. 1 ("lm 8.: = :c2x10'7H- '1 477.50 47r 0 m = 8.987551 7873681764 x109 N-m2 - C '. So, then our final step. We have to try to imagine that this is not a perfect simulation and instead we are using multimeters that do have some uncertainty. We would need to make a conclusion that can be expressed quantitatively, or using values. We usually accomplish this by calculating a percent error. B. Percent Error - Indicates accuracy of a measurement your value given value In the equation above, the accepted value is Coulomb's constant and the experimental value is your slope. Don't be surprised if you have pretty close to 0% error as this is a simulation. We are just trying to make all of the steps using these simulations as realistic as possible so when done correctly they usually result in 0% error. Your lab report that is turned in should have the following sections which should be labelled. l have also provided a sample lab report that is formatted correctly so you know what is expected in your lab report. You can email me your lab report early and I will give you feedback on where you made a mistake or what you have forgotten to include. Title Introduction Procedure Data and Results Conclusion