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MIMTY 1/19/11 or 1/20/11 What does electric potential mean? MIMTY Summarizing Notes notes Take the next 5 minutes and do the following: 1)Summarize your notes from yesterday in a paragraph. 2) Create 3 questions you could ask about these notes. Your questions should use verbs from the following parts of your verb sheet: - 1 question using “knowledge” or “comprehension” - 1 question using “application” or “analysis” - 1 question using “evaluation” or “synthesis” 1 more question using “synthesis” Electric Potential Review Which of the charges shown below has the highest charge? A B D C E Electric Potential Review An electron is placed in the electric field as shown below. Which way will the electron move over a short period of time? A) up B) left C) down D) right E) It won’t move electron Electric Potential Review Imagine the shape below was made of metal and was covered with a negative charge. Where would the charge be most concentrated? A B C D E A) “A” B) “B” C) “C” D) “D” E) “E” Electric Potential Review Which drawing below shows how the electric field lines would look outside the charged sphere? Assume the charge is +1. no lines A B C D E Electric Potential Review Which point on the diagram below has the highest voltage for a positive charge? 0 volts A B C D E A) “A” B) “B” C) “C” D) “D” E) “E” Assignment List Assignment Get syllabus signed 7 Devices for phys II Electric Charge PP Electrostatic Walkaround Lab Electric Potential PP Assigned Due 1/4/11 1/6/11 1/11/11 1/12/11 1/19/11 1/10/11 1/10/11 1/18/11 1/18/11 1/27/11 Electric Potential Practice Problems 1) We have 2 charges as shown below. At which point A, B, or classwork C (or D: none of them) is the electric field zero? Prove it! Where (if anywhere) in problem #1 is the electric potential zero? 2) A drop of ink carries a charge of 1.6 x 10-10 C and is deflected in an electric field with a force of 3.2 x 10-4 N. What is the strength of this field? 3) A lightning bolt uses 200 million joules of energy. If this bolt carries 2 C of charge, what is the voltage of the bolt? 4) How can electric field lines show the strength of an electric field? 5) The Earth has an electric field with a strength of 1000 N/C. This field points inward toward the center of the Earth. Is the Earth positively or negatively charged? 6) Find the voltage change when an electric field does 12 J of work on a 0.0001 C charge. Which direction is the electric field pointing at the black dot in the 2 examples at right? Quiz Review Below are a number of practice problems to help you get ready for the quiz. If you feel confident with these, study on your own or catch up with missing work. - Explain how any combination of 2 charged particles will move when placed near each other. Explain the difference between charge and energy. Define electric potential and voltage. Be able to find the force between any 2 charges. Know the difference between electric field and electric potential. Know the difference between charging by induction and charging by contact. Know how to calculate the strength of an electric field. Exit Question #7 The electric potential of one negative charge placed next to another negative charge will be.... a. b. c. d. e. f. Low High Low but negative High but negative It depends on the size of each charge It depends on exactly how close they are