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
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- Using your understanding of three subatomic particles, what is an electric charge? With respect to the presence of charged particles, how does a body become a. positively charged? b. negatively charged? Charging an object by induction also occurs through the process called grounding? What makes grounding similar to conduction? In your own words, describe how electrically neutral bodies become charged by the following methods. a. rubbing or friction b. conduction c. inductionV. EVALUATION: Read each item carefully and choose the letter of the best answer. 1. Which of the following statements below CORRECTLY distinguish between charging by rubbing and charging by induction? a. Charging by rubbing results to transfer of electrons from one body to another without physical contact while charging by induction results to redistribution of charges without physical contact. b. Charging by rubbing results to transfer of electrons from one body to another with physical contact while charging by induction results to redistribution of charges with physical contact. c. Charging by rubbing results to transfer of electrons from one body to another with physical contact while charging by induction results to redistribution of charges without physical contact. d. Charging by rubbing results to transfer of electrons from one body to another without physical contact while charging by induction results to redistribution of charges with physical contact. 2. When you rub a…B. Measurment of the Electric Field Table (1.2) V(volt) d(cm) 0.6 0.9 9 1.1 11 1.4 13.5 1.6 15.5 1.9 18.5 2.3 23 1. Plot V versus d, find the slope of your graph. add the slope on your graph using add trendline option. 2. How does the slope related to the electric field ? 3. What conclusion can you draw about electric field in the region between electrodes near the center?
- Given a rectangular configuration of charges with side a=0.40 cm and the other side b=0.50 cm, where |q1|=|92| = |g3| = 60nC. Please note that q2 is negatively charged 1. What is the voltage at the upper left-hand corner of the square? 2. How much work does it take to bring an electron to the fourth corner? 3. How much energy did it take to assemble these charges? (Involved problem!) 9₁ D b a2. Describe what happens when a plastic sheet brought near the metal disk of the electroscope is positively charged. Draw a diagram to show how the electrons move in this case. 3. Describe the steps to be followed to charge two metal spheres by induction. Draw diagrams to show what happens. 4. The force of attraction between two identical charges is Fg when they are separated by a distance r. What will happen to the magnitude of the force if r is doubled? if r is halved? 5. Three spheres labeled A, B, and C are each suspended by an insulating thread. One of them is positively charged, another is negatively charged, and the other one is uncharged. A fourth sphere made of polythene is rubbed with a cloth and brought near (but not touching) each suspended sphere in turn. The following effects are observed: Sphere A = attraction %3D Sphere B= repulsion Sphere C= attraction From the given observation, what is the nature of each of these spheres? What can you do to identify specifically the…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
- 2. a. Draw a force vector at A for a positive test charge. b. Draw a force vector at point B for a negative test charge. c. How much work is done by the field if a charge of q = 2x 10-3 C. is moved from A to C? d. How much work is done by the field if the same test charge moves from A to D? C A 6V OV 5V 4V 3V 2V 1VA. What is the physical definition of thermoelectric effect? B. What are the classical models of the thermoelectric effect? C. Provide your opinion on the potential development of thermoelectric energy in renewable and sustainable energy industries.1. Why are electrical insulators important? a. They help the flow of electricity b. They provide power for electric circuits c. They are used to protect us from electricity d. They help conduct heat 2. A plastic rod is rubbed with a piece of animal fur. The plastic rod acquires a negative charge during this process. Which of the following is true about the charge on the piece of fur? a. It acquires a positive charge but greater in magnitude than the rod b. It acquires a negative charge but less in magnitude than the rod c. It acquires a positive charge but less in magnitude than the rod d. It acquires a negative charge but greater in magnitude than the rod
- 1. What is the voltage of a 6.5 cm solid metal sphere that has a -4.00 nC static charge away from the center of a 1 cm diameter? 2. A demonstration Van de Graaff generator has a 30.0-cm-diameter metal sphere that produces a voltage of 150 kV near its surface (look at the figure below). What excess charge resides on the sphere? (Assume that each numerical value here is shown with three significant figures.) ide of shy meal sphere Alunum sphe Conduci Covered puley Coveed puy Vos -MotorTime left 0:55:57 Question 8 A charge of + 10 nC is distributed uniformly along the circumference of a circle with a radius of 20 cm. How much external Not yet answered energy is required to bring a charge of + 50 mC from infinity to the center of the cirdle? Marked out of 1.00 P Flag question A. 225 J B. 112.5 J C. 22.5 J D. 11.25 J E. 0.45 J3. 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.