317 (F96) PreTest

317 (F96) PreTest -...

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Unformatted text preview: 7########,##################A##############k########################## [####_#####"###.##;####;####;#@##{#:###L#########L##M#x###V### ######P#*##z###g#.# # ##P#####S##P####P######,##P####P####P####P####P####P####Name Section Number Signature Print your name, sign your name, and provide your section number LEGIBLY in the spaces provided above. Print your name at the top of each page. This exam consists of four questions, each consisting of several parts of varying difficulty. If you cannot do one part, move on to the next. Partial credit will be given for all parts of this exam. Show your line of reasoning; a final answer in itself is not sufficient. To get full credit, you must show clearly how you obtained your answers. THIS IS A CLOSED BOOK EXAM.Do not open the exam before 6:00 PMCompleted exams will not be accepted after 7:25 Pm Newtons second law: #o(F,)Net = m#o(a,)Coulombs law: | #o(F,) | = k #f(q1q2,r#o(2))Electric field: #o(F,)by 1, on 2 = q2#o(E,)due to 1 at location of 2Electric field due to a point charge: | #o(E,) | = k #f(q,r#o(2))Constants: qe = 1.6 x 10-19 C k = 9.0 x 109 Nm2/C2Work Energy: Wext agent = Detotal = DKE + DEPEKE = #f(1,2) m v2DEPE = qtest DV Electric potential: DV = E d (due to uniform E field) V = k #f(q,r) (due to point charge) 1. A. A small metal ball mounted on an insulating stand is brought near a second metal ball suspended from an insulating string. The balls are observed to repel as shown below.#i. [5 pts] What, if anything, can be said about the charges of the two balls? Explain your reasoning..#ii. [8 pts] In the spaces to the right, draw a separate free-body diagram for Ball A and Ball B. Clearly label all forces to indicate the object exerting the force, the object on which the force is exerted, and the type of force.B. Without touching Ball B, Ball A is removed and a new metal ball mounted on an insulating stand (Ball C) is brought near Ball B. The balls are observed to attract as shown below.# [6 pts] What, if anything, can be said about the charge of ball C? Explain your reasoning.C. Finally, Ball A and Ball C are brought near one another.# [6 pts.] Do the balls attract or repel? Explain your reasoning. If it is not possible to determine this, state this explicitly and explain why not. #2. [25 points total]A. [15 pts] The electric field lines shown at right represents the electric field near three point charges q1, q2, and q3. i. Sketch a vector on the diagram to show the direction of the force exerted on a positive test charge at point P. Draw your vector about one inch long. ii. What do the field lines suggest about the signs and approximate relative magnitudes of q1, q2, and q3? Explain. iii. Point a is the same distance from q1 as b is from q3. How does the magnitude of the net electric field at a compare to the magnitude of the net electric field at b? Explain your reasoning.B. [10 pts] Three point charges lie along a line as shown. Three point charges lie along a line as shown....
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317 (F96) PreTest -...

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