Coulomb_yip

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Arizona State University *

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132

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Physics

Date

Feb 20, 2024

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pdf

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7

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1 (1 point) Experiment Title: Coulomb ’ s Law 5-digit Section #: PHY132-13710 Student’s name: Puurich Yip TA’s Name: Francesco, Sang-Eon Instructions for the student: Follow along with the lab manual and fill out this template as you complete the experiment. It is generally recommended for you to read the Intro & Theory section of the manual and watch the provided video(s) before you begin. Show your work for all calculations (don’t forget about units!). Before submitting your report, delete all text shown in red (this text included), and leave all text shown in black or blue in the final copy of your report.
2 OBJECTIVE ( 3 points ): What are the physics concepts/theory/law to be investigated in this experiment? How does the procedure for data collection & analysis connect to the theory? Write two or three sentences in your own words. The objective of this lab is to discover and play with how protons and electrons work, and why charges matter. We will be investigating Coulomb ’ s Law, which will helps us understand point charges, and how they interact with each other. EXPERIMENTAL DATA ( 6 points ): Obtain experimental data from the KET simulation that will be used for further calculations. The data are just the items in blue as shown below. PART 1: Calculating the charge on the pith balls: a- Wand Charge #: WC 1 = 120 b- “Charge on Each Ball” as shown in the info box: Q 1 = 6.17*10^-9 C c- Actual charge on each pith ball (negative of value from info box) 𝒒 ? = - 6.17*10^-9 C d- Mass of the pith ball as shown in the info box = 0.05 grams e- Angle θ between the string and the vertical line: 6 degrees f- Separation distance r between the centers of the pith balls: 8 cm g- Draw a free body diagram for one of the balls (label if it is the left or the right one)
3 PART 2: Calculating the mass of the pith balls & the tension force of the string: a. Wand Charge #: WC 2 = 105 b. “Charge on Each Ball” as shown in the info box: Q 2 = 5.05*10^-9 C c. Actual charge on each pith ball (negative of value from info box) 𝒒 ? = - 5.05*10^-9 C d. Separation distance r between the centers of the pith balls: 7 cm e. Length of the pendulum = 39 cm f. Using measured distance and the length of the pendulum calculate the deflection angle (with the vertical) by using trigonometric functions: θ calculated = 10.34 degrees PART 3: Calculating the electrostatic constant k : a. Wand Charge #: WC 3 = 70 b. “Charge on Each Ball” as shown in the info box: Q 3 = 2.75 *10^-9 C c. Actual charge on each pith ball (negative of value from info box) 𝒒 ? = -2.75 *10^-9 C d. Separation distance r between the centers of the pith balls: 4.5 cm e. Angle θ between the string and the vertical line: 3.5 degrees DATA ANALYSIS & RESULTS ( 10 points ): Fig.1: Free-body diagram of pith ball.
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4 VARIABLE DEFINITIONS ( 1 of 10 points ): - i.e. F g = force of gravity between the Earth and the pith ball. - Create space as necessary Part 1
5 - C=unit of electrical charge - mg= mass times the acceleration of gravity - T= tension, measuring the pulling force of the pith balls - Theta= the angle created by the pith ball Part 2 R=Distance between 2 balls L= length of string Part 3 - K= Coulomb ’ s constant, is the electrostatic force between charged objects - DISCUSSION & CONCLUSION ( 10 points ): Coulomb’s law states that F=k(q1q2/r^2). K is a constant that describes an electrostatic force between 2 charged objects. With this experiment, we got to charge 2 pith balls, and made measurements based on how charged the rod was. With our findings, we were able to calculate for the charge of the balls, the mass of the balls, the tension in the string of the ball, and finally, the constant K. We proved and justified coulomb ’ s law with some simple math. With the simulation, it gave us the majority of our key data. We just had to rearrange some numbers and solve for our unknowns, given 3 scenarios. This experiment showed us that the electrical force between 2 objects (in this case the balls) is directly proportional to the charge.
6 Clearly label all answers to the conceptual questions below and separate them from the rest of your discussion. 1. Of the three types of charging, which two were used in this lab? Explain how they were used. Friction: rubbing the wand on the cat Conduction: directly touching the charged wand to the balls 2. How many extra electrons reside on each pith ball? The charge of an electron is -1.602 x 10 -19 C. N=Q/e So n=6.17x10^-9/-1.602x10^-19 =4.1x10^10 extra electrons 3. What is the gravitational attraction force ? 𝑔𝑟𝑎𝑣 between the two pith balls? Know that ? 𝑔𝑟𝑎𝑣 = ? 𝑚 1 𝑚 2 𝑟 2 , where G is the gravitational constant = 6.67*10 -11 N m 2 /kg 2 . 4. How does the gravitational attraction between the two pith balls compare to the electrostatic force between them? Calculate the ratio of F electr / F grav . What can you infer from this ratio?
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7 Fg is almost negligible in this case.

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