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Transcript
6/27/2017 P30 Unit B UA pt. A – Electricity Name: ______ Date: ______ Show all work, including starting equations, units and proper sig-digs, to receive full marks. 1. In a classroom demo, the dome of a Van de Graaff generator was initially charged negatively. A stream of closely spaced neutral soap bubbles was blown toward the dome of the generator. Much to the surprise of the LD and his students, the following observations were made: 1. The bubbles were initially attracted to the dome until the first bubble hit the dome. 2. The first bubble hit the dome and splattered 3. All the other bubbles stopped in mid-air before repelling from the dome of the generator and from each other. Using the concepts of electrostatic forces and charge distribution, explain: Why the soap bubbles were initially attracted to the top of the generator. (2 marks) Why, after the first bubble splattered, the other bubbles were repelled away from one another. (2 marks) A diagram or diagrams may be used to help you communicate your idea. 2. A single neutral 2.00 g pithball is touched by a charged rubber rod which had a charge of 2.3 x 10-8 C. The pithball then comes into contact with another pithball of equal size and shape. If the two pithballs are hung by two pieces of 3.00 cm thread from a single point (as shown) forming an angle of 15.0˚, what is the charge remaining on the original charged rod? (1.46 x 10-8 C) (4 marks) LD Industries 6/27/2017 Use the diagram to the righ to answer the next question: 3. A proton, electron and alpha particle are arranged as shown above. Using your data table and the diagram given, determine the magnitude and direction of the electric force acting on the proton due to the alpha particle and the electron. (5.9 x 10-18 N 74° S of W) (6 marks) 4. Draw a diagram showing the field lines in each of the following situations. (Cut and paste the diagrams at the end of this package into your unit assignment!) (1 mark for each diagram) Use the diagram to the right to answer the next question. 5. In the early 1800’s LD’s favorite scientist from history, Michael Faraday performed an experiment used to investigate electric fields. This is now called Faraday’s Ice Pail Experiment. In the experiment, a hollow conducting ice pail is placed on an insulated plate. One electroscope is attached to the outside of the pail and one is attached to the inside of the pail. A positively charged rod is brought into the pail. Predict which electroscope will show a deflection when the rod is brought into the pail and justify your response using the principles learned in class (HINT: page 557-558 of your Pearson) (3 marks) LD Industries 6/27/2017 6. A negative charged particle that has a mass of 2.8 x 10-16 kg accelerates upwards at 2.8 m/s2 in the electric field between two horizontal plates that have a separation of 0.15 m. The potential difference across the plates is 4.2 x 102 V. Taking into consideration the force of gravity, find a) The magnitude and direction of the electric force on the particle. (3.5 x 10-15 N up) (3 marks) b) The magnitude of the particle’s charge. (1.3 x 10-18 C) (3 marks) 7. An electron, travelling horizontally at a speed of 5.45 x 106 m/s, enters a parallel plate capacitor with an electric field of 125 N/C between the plates. The separation between the plates is 6.20 mm. Ignoring gravitational effects, if the electron passes from the top plate to the bottom plate, how far will it have traveled into the capacitor? (0.130 m) (3 marks) Cut and paste these diagrams! Bonus Questions: Answer Only ONE!!! Fair Bonus Question: Describe Michael Faraday’s youth. Unfair Bonus Question: Who has the best afro? Justify your response. LD Industries