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Transcript
Grade 11 Physics – Electric Field Problems 1. A negative test charge of 2.0 x 10-8 C experiences a force of 0.060N [right] in an electric field created by a positive 6.8 x 1010C charge located to the right of the negative test charge. What is the magnitude and direction of the electric field where the test charge is located? 2. A positive test charge of 3.75 x 1013 ec is in an electric field of 50.0 N/C [East]. What is the magnitude and direction of the force exerted on the charge? 3. Perform the following conversions. a. 8.0 C to ec. b. 6.4x1015 N/ec to N/C. c. 8.00x10-18 N/C to N/ec 4. A charge of – 3.0 C is in an electric field of 60 000.0 N/C [up]. What is the magnitude and direction of the force on the charge? 5. A charge of + 6.0 ec has a force of 4.8x10-15 N [Left] acting on it. What is the magnitude and direction of the electric field there? 6. When in an electric field of 25 000 N/C [South] a charge had a force of 0.80 N [North] on it. a. Calculate the charge on this object. b. How many electrons has it lost or gained? 7. In a Millikan experiment the electric field between the parallel plates was 88 000 N/C [up]. A drop with a mass of 4.3x10-15 kg was held in balance. What was the charge on this drop in Coulombs? 8. In a Millikan apparatus an electric field of 1.47 x 10 6 N/C [up] was enough to hold an oil drop in balance. The drop of oil had a mass of 2.4 x 10 – 14 kg. a. Is the top plate positive or negative? b. How many electrons has the drop gained or lost? 9. An oil drop with a mass of 4.20 x 10-15 kg had a charge of – 3.00ec and is between parallel plates. There is an electric field of 130 000.0 N/C [down] between the plates. What is the magnitude and direction of the acceleration of the drop? K. Byrnes PHY30S Grade 11 Physics – Electric Field Problems Answers 1. 3.0 x 106 N/C [left] 2. 3.00 x 10-4 N [East] 3. (a) 5.0 x 1013 ec (b) 4.0 x 1034 N/C (c) 1.28 x 10-30 N/ec 4. 0.18 N [down] 5. 8.0 x 10-16 N/ec [Left] 6. (a) – 3.2 x 10-5 C (b) 2.0 x 1014 electrons gained 7. +4.8 x 10-19 C 8. (a) negative (b) 1 electron lost 9. 5.06 m/s2 [up] K. Byrnes PHY30S