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ELECTRIC FIELDS – All Types (Recall, 1 elementary charge = 1.60 x 10 –19 C 1. In a certain region of space, a force of 3.5 N is exerted upon a body of 1.80 x 10 –19 C charge. What is the magnitude of the electric field at that point in space? 2. An electron, which carries 1 elementary unit of charge is in an electric field and experiences a force of 7.00 x 10 –16 N. Find the magnitude of the electric field at that location. 3. A body whose charge is 5.00 x 10 –5 C is subjected to an electrical force of 0.0300 N. a) What is the electrical field at this point? b) If this first body is removed, and replaced by a second body, this second body experiences a force of 1.80 x 10 –15 N. What is the charge on this second body? How many units of elementary charge is this? 4. If a charge of 5.20 x 10 –7 C is placed in an electric field where the field intensity is 2.50 x 10 5 N/C, what will be the magnitude of the force acting on the charge? 5. Suppose the electric field between the plates is 2.50 x 10 5 N/C. What force would be exerted upon the following if they were put between the plates? a) Al 3+ ion b) O 2- ion (Hint: 1 elementary charge = 1.60 x 10 –19C) 6. What is the magnitude of the force exerted on an electron in an electric field of 600 N/C? 7. An oil droplet is suspended in mid air above a charged plate. The field strength at the point where the droplet is 85 N/C. The charge on the droplet is estimated to be 3 elch. What is the mass of the oil droplet? 8. A student is using a Millikan apparatus and finds the following: -10 - an oil droplet of mass 1.8 x 10 kg suspended above a charged plate. - the electric field is found to be 2.7 N/C at the point of the droplet. Find the charge of the droplet in elementary charges. 9. An oil droplet of radius 0.0003 cm is located in a Millikan’s apparatus. It is suspended 3 in mid air above a 0.45 N/C electric field. The density of oil is 800 kg/m . Determine the charge of the droplet in Coulombs. 10. An oil droplet of diameter 0.0003 cm is located in a Millikan’s apparatus. It is 3 suspended in mid air above a 0.30 N/C electric field. The density of oil is 800 kg/m . Determine the charge of the droplet in elementary charges. 11. An oil droplet of diameter .008 cm is located in a Millikan’s apparatus. It is 3 suspended in mid air above an electric field. The density of oil is 800 kg/m . If the oil droplet is found to have a charge of 4 elch, determine the field strength at the point in space where the drop is. Answers 1. 1.94 x 1019 N/C 2. 4.375 x 103 N/C 3. 600 N/C b) 19 electrons 4. 0.13 N 5. 1.2 x 10-13 N b) 8 x 10-14 N 6. 9.6 x 10-17 N 7. 4.08 x 10-17 N m = 4.163 x 10-18 kg 8. 4.074 x 109 elch 9. q = 1.97 x 10-12 C 10. 2.31 x 106 elch 11. 3.284 x 109 N/C