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Knowledge & Understanding (Sig Figs, Units, Direction) Scientific Inquiry & Problem Solving Communication & Application Name:___________________ 1 12 Grade 11 Physics – Electric Field Quiz For full marks, you must show all your work, including formulas. You must also and use the correct sig figs and units in your answers. 1. Use the following electric field diagram to answer the following questions: (4 marks) x y (a) Is charge C positive or negative? (b) Is charge D positive or negative? (c) On the diagram, draw the direction a proton at x would feel a force. (d) On the diagram, draw the direction an electron at y would feel a force. 2. A charge creates an electric field of 5.0 x 104 N/C [South]. If a test charge of –2.0 ec is placed in that field, then what is the magnitude and direction of the force on that charge? (3 marks) L. Mann PHY30S 3. An oil drop in a Millikan experiment, whose mass is found to be 4.95 x 10-15 kg is balanced between two large parallel plates. The electric field strength between the plates is 5.10 x 104 N/C [down]. (a) Is the top plate positive or negatively charged? (1 mark) (b) Calculate the charge (in Coulombs) on the oil drop. (2 marks) (c) Did the oil drop lose or gain electrons? (1 mark) (d) How many electrons did it lose or gain? (1 mark) Correct Sig Figs and Units: There will be 1 mark given for using the correct sig figs and units throughout the quiz. There will be 0.5 marks taken off for each mistake, to a maximum of 1 mark. L. Mann PHY30S Name: _______________________ 15 Grade 11 Physics – Electric Field Assignment #2 For full marks, you must show all your work and use the correct sig figs and units in your answers. 1. Use the following electric field diagram to answer the following questions: (4 marks) x y (a) Is charge C positive or negative? (b) Is charge D positive or negative? (c) On the diagram, draw the direction a proton at x would feel a force. (d) On the diagram, draw the direction an electron at y would feel a force. 2. A positive point charge creates an electric field of 5.0 x 104 N/C at a point directly south of the charge. If a test charge of –2.0 C is placed at that location, then what is the magnitude and direction of the force on that charge? (2 marks) 3. A charge of +5.00 C is placed in an electric field between two charged plates. The electric field strength is 4.00 N/C [down]. The mass of the charged particle is 2.00 x 10-4 kg. Determine the magnitude and direction of the acceleration of the charged particle between the plates. (3 marks) L. Mann PHY30S 4. How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.4 C? (1 mark) 5. An oil drop in a Millikan experiment, whose mass is found to be 4.95 x 10-15 kg is balanced between two large horizontal plates. The electric field strength between the plates is 5.10 x 104 N/C [down]. (a) Is the top plate positive or negatively charged? Explain. (1 mark) (b) What is the charge on the oil drop? (2 marks) (c) Did the oil drop lose or gain electrons? (1 mark) (d) How many electrons did it lose or gain? (1 mark) L. Mann PHY30S Grade 11 Physics – Electric Field Practice 1. Use the following electric field diagram to answer the following questions: x y (a) Is charge C positive or negative? (b) Is charge D positive or negative? (c) On the diagram, draw the direction a proton at x would feel a force. (d) On the diagram, draw the direction an electron at y would feel a force. 2. A positive point charge creates an electric field of 5.0 x 104 N/C at a point directly south of the charge. If a test charge of –2.0 C is placed at that location, then what is the magnitude and direction of the force on that charge? 3. A charge of +5.00 C is placed in an electric field between two charged plates. The electric field strength is 4.00 N/C [down]. The mass of the charged particle is 2.00 x 10-4 kg. Determine the magnitude and direction of the acceleration of the charged particle between the plates. L. Mann PHY30S 4. How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.4 C? 5. An oil drop in a Millikan experiment, whose mass is found to be 4.95 x 10-15 kg is balanced between two large horizontal plates. The electric field strength between the plates is 5.10 x 104 N/C [down]. (a) Is the top plate positive or negatively charged? Explain. (b) What is the charge on the oil drop? (c) Did the oil drop lose or gain electrons? (d) How many electrons did it lose or gain? Answers: 1. 2. 3. 4. 5. a) positive b) negative c) and d) 1.0 x 105 N [North] 1.00 x 105 m/s2 [down] 1.5 x 1013 electrons removed a) Positive. The electric field is the direction a positive would feel a force, and it would be repelled by the top plate. b) 9.51 x 10-19 C c) gained electrons d) 5 electrons L. Mann PHY30S