Coulombs_Law_PHET

PHYSICS II LAB Coulomb’s Law Lab The Coulomb constant “k” is named after Charles-Augustin de Coulomb. This constant is associated with the electric force and is also known as the electric force constant. When charged particles interact, a force repels or attracts the particles. For instance, two like charges (such as a proton and a proton) repel each other and travel in opposite directions and two unlike charges (such as an electron and a proton) will be attracted to each other. The electrostatic force equation is shown below: ⃗ F = k | q 1 || q 2 | r 2 Where ? = ? . 𝟗?? × 𝟏? 𝟗 ? ∙ ? ? . ? Objective: Find the Coulomb Constant. We will use the simulation below: https://phet.colorado.edu/en/simulation/coulombs- law Figure 1: Coulomb’s Law simulation. ?

Directions: Answer the following questions. 1. What is the equation for Coulomb’s Law and define each variable in the equation? Equation: F=kq1q2/r^2 F is the force between two charges, q1 and q2 are the magnitude of two charges. R is the distance between two charges and k is the proportionally constant and its value is 8.998x10^9Nm^2/C^2 2. What is the definition electric charge? Electric charge is the basic property of matter that is carried by the elementary particles and how these particles are affected by the electric and magnetic field. Electric charge can be either positive or negative and neither be created or destroyed. 3. As the distance between electric charges increase, the electric force: a. Increases b. Decreases c. Remains the same 4. As the distance between electric charges decrease, the electric force: a. Increases b. Decreases c. Remains the same 5. Like charges: a. Repel b. Attract c. None of these 6. Unlike charges: a. Repel b. Attract

Problem: Three-point charges lie along a straight line as shown in figure 1 below, where ? 1 = 6.00 𝜇? , ? 2 = 1.50 𝜇? , and ? 3 = −2.00 𝜇? . The separation distances are ? 1 = 3.00 𝑐? and ? 2 = 2.00 𝑐? . Calculate the magnitude and direction of the net electric force on: Figure 1 (a) ? 1 (b) ? 2 (c) ? 3 Show your work!!!! Procedure: 1. Go to the following site to access the lab simulation for Coulomb’s Law and download the simulation. https://phet.colorado.edu/en/simulation/coulombs-law 2. open it 3. select Macro Scale 4. Set charge 1 to 10 𝜇? and set charge 2 to 1 𝜇? . Remember 1 ? = 1 × 10 −6 𝜇? 5. Make sure force value box is checked. 6. In data table 1 below the separation distance “r” is given to you. Separate the charges by 10 cm. 7. Record the force value in data table 1. It does not matter which force value you use since you are only recording the magnitude of that force. 8. Repeat the process for the rest of the values. 9. Record the value for the separation distance in meters. Record your values in data table 1.

10. Find 1 r 2 . Record your values in data table 1. Value of ? 1 = ? 2 = r (cm) r (m) F (N) m ( ¿¿ − 2 ) 1 r 2 ¿ 10 0.1 8.988 100 8 0.08 14.043 156.25 6 0.06 24.965 277.78 4 0.04 56.172 625 2 0.02 224.689 2500 Data Analysis 1. Once you have completed data table 1 make a graph of Force vs. Separation Distance. You do not need to put an equation and R squared value on this graph. 2. Make a second graph of Force vs 1 r 2 . You MUST put the equation and R squared value on this graph. 3. Use the Force vs. 1 r 2 graph to find the value of the Coulomb Constant “k”. Slope=0.0899 Q1=(10x10^-6)C q2= 1x10^-6C Q1*q2= 1x10^-11 K=0.0899/1x10^-11 K=8.99x10^9Nm^2/C2 ****NOTE****Submit all graphs with this assignment!!!!

Quick Activity Watch the video “Spinning Nanofibers to Improve N-95 Masks” on electrospinning. Explain what this process is in the space provided below. How is the electric force used in this process? Video Spinning Nano fibers to improve N-95 maskshttps:// www.youtube.com/watch? v=llqx8FfnCXs Nanofiber filter membrane is being used which stretches and helps the person to take a breath. So, a process is being made through which masks have a nanofiber filter membrane which makes the mask more protective. This process is upgrading the masks to make them more protective.