* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Electric Fields Test - Westgate Mennonite Collegiate
History of quantum field theory wikipedia , lookup
Casimir effect wikipedia , lookup
History of subatomic physics wikipedia , lookup
Speed of gravity wikipedia , lookup
Electron mobility wikipedia , lookup
Elementary particle wikipedia , lookup
History of electromagnetic theory wikipedia , lookup
Introduction to gauge theory wikipedia , lookup
Maxwell's equations wikipedia , lookup
Electrical resistivity and conductivity wikipedia , lookup
Anti-gravity wikipedia , lookup
Fundamental interaction wikipedia , lookup
Aharonov–Bohm effect wikipedia , lookup
Electromagnetism wikipedia , lookup
Field (physics) wikipedia , lookup
Lorentz force wikipedia , lookup
Atomic theory wikipedia , lookup
Knowledge & Understanding (Sig Figs/Units, Multiple Choice, #1 - 5) 19 Scientific Inquiry & Problem Solving (#6 - 10) Communication & Application 19 Name: __________________________ Grade 11 Physics – Electric Fields Test You must show all your work for full marks (excluding multiple choice), include the formula you are using and round answers to the correct sig figs and units. Multiple Choice: Choose the best answer (1 mark each) 1. If there is a force of 5.0 x 10-12 N [left] acting on an electron, the electric field at the location will be: a. zero. b. 8.0 x 10-31 N/C [left] c. 3.1 x 107 N/C [left] d. 3.1 x 107 N/C [right] 2. The electric field lines for the following parallel plates would be directed: a. b. c. d. + + + + - upward to the left to the right zero, so its direction would be without meaning 3. A physics student, Billy, uses a piece of silk to rub a comb. The comb then becomes positively charged. The comb is positively charged because it: a. gains electrons b. gains protons c. loses electrons d. loses protons L. Mann PHY30S 4. The diagram shows the electric field lines between two electrical charges P and Q. Which of the following statements about the charges on P and Q is correct? a. b. c. d. P is positive and Q is negative P is negative and Q is positive P and Q are both positive The charge cannot be determined with only field lines 5. The same physics student, Billy, draws the following diagrams to illustrate the electric field between two charged objects. Which of them is incorrect? A B D C 6. Billy now rubs a rubber mat with fur during class and finds out that the mat becomes negatively charged. What has happened between the mat and the fur? a. The protons in the mat are transferred to the fur b. The electrons in the mat are transferred to the fur c. The protons in the fur are transferred to the mat d. The electrons in the fur are transferred to the mat 7. The diagram below shows the electric field lines of a negative point charge. The strength of the electric field is: a. The greatest at point P b. The greatest at point Q c. The greatest at point R d. The same at all three points L. Mann PHY30S 8. A neutral object loses 3 electrons. What is its charge in Coulombs? a. -3C b. -4.8 × 10-19C c. +3C d. +4.8 ×10-19 C 9. In a Millikan experiment, an oil drop is balanced between two charged plates (as shown below). If the oil drop has a positive charge, which must be true: a. The electric force points down b. The force of gravity points up Positive charge c. The electric field points up d. The electric field points down Conversions 1. Convert 3.5 x 10-4 C to e.c. (1 mark) 2. Convert 21.3N/C to N/e.c. (1 mark) 3. An oil drop has a charge of -1.2 x 10-11C a. Has the oil drop lost or gained electrons? (1 mark) b. How many electrons has it lost or gained? (1 mark) L. Mann PHY30S Electric Field Lines 4. Draw the electric field diagram for two positive charges (2 marks) 5. For the following electric field, draw the direction a a. proton would feel a force at point x (1 mark) b. electron would feel a force at point y (1 mark) x y L. Mann PHY30S Electric Fields 6. A +2.0 e.c. charge is placed in an electric field of 1.9 x 1020 N/C [up]. What is the magnitude and direction of the electric force it feels? (3 marks) 7. An electron is placed in an electric field and feels an electric force of 3.4N [up]. What is the magnitude and direction of the electric field? (3 marks) 8. Two charged particles are placed in the same electric field, both the same distance away from the charge creating the field. One particle has a charge of +1.3 x 10-11 C and feels a force of 2.4N [E]. The other particle has a charge of -2.4 x 10-14 C, what is the magnitude and direction of the force it feels? (3 marks) L. Mann PHY30S Millikan’s Experiment 9. An oil drop with a mass of 1.22 x 10-14 kg is held in balance between two parallel plates. The electric field between the two plates is 1.50 x 105 N/C. a. If the top plate has a negative charge, is the oil drop positively or negatively charged? Explain. (2 mark) b. Calculate the charge on the oil drop. (3 marks) c. Has the oil drop lost or gained electrons? (1 mark) d. How many electrons has it lost or gained? (1 mark) L. Mann PHY30S Parallel Plates 10. A particle with a charge of +3.11 x 10-12 C is located in an electric field of 4.00 x 10-2 N/C [up] between two parallel plates. The charge is accelerating at 54.3m/s2 [up]. Calculate the mass of the charge. (3 marks) Correct Sig Figs and Units: There will be 2 marks given for using the correct sig figs and units throughout the test. There will be 0.5 marks taken off for each mistake, to a maximum of 2 marks. I will not be concerned with the number of sig figs for questions 4, 5, 9(d). L. Mann PHY30S