p240f07final-ver1 - Physics 240 Fall 2007: Final Exam...

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Version 1 Page 1 Physics 240 Fall 2007: Final Exam Please print your name:___________________________________________________ Instructions 1. Fill in your name above 2. This will be a 2.0 hour, closed book exam. The exam includes 25 questions. 3. You may use a calculator, please do not share calculators 4. You may use four 3”x5” note cards or one 8.5”x11” sheet with notes and equations you think may be useful. You can write on both sides if you like. Table of constants: ε 0 = 8.85 x 10 -12 C 2 /Nm 2 k = 1/(4 πε 0 ) q electron =-1.6 x 10 -19 C q proton =1.6 x 10 -19 C m electron =9.1 x 10 -31 kg m proton =1.67 x 10 -27 kg μ 0 = 4 π x 10 -7 Tm/A G = 6.67 x 10 -11 Nm 2 /kg 2 c=3.00 x 10 8 m/s
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Version 1 Page 2 1. A battery is used to charge a parallel-plate capacitor, after which it is disconnected. Then the plates are pulled apart to twice their original separation. This process will double the: A) capacitance B) surface charge density on each plate C) stored energy D) electric field between the two places E) charge on each plate
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Version 1 Page 3 2. In the diagram, the y ( t ) = y m sin( ω t ) is plotted as a solid curve. The other three curves have the form y ( t ) = y m sin( t φ ), where φ is between π /2 and + π /2. Rank the curves according to the value of φ , from the most negative to the most positive. A) 2, 3, 1 B) 1, 3, 2 C) 2, 1, 3 D) 3, 2, 1 E) 1, 2, 3 3. The diagrams below depict four different charge distributions. The charges are all the same distance from the origin. Rank the situations according to the magnitude of the electric field at the origins, least to greatest. A) 4, 1, 2, 3 B) 2, 1, then 3 and 4 tie C) 1, 2, 3, 4 D) 4, 3, 2, 1 E) 1, 2, then 3 and 4 tie
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Version 1 Page 4 4. Two identical batteries, each with an emf of 18 V and an internal resistance of 1 Ω , are wired in parallel by connecting their positive terminals together and connecting their negative terminals together. The combination is then wired across a 4- Ω resistor. The current in the 4- Ω resistor is: A) 1.0 A B) 2.0 A C) 4.0 A D) 4.6 A E) 7.2 A 5. An electric field exists in the cylindrical region shown and is parallel to the cylinder axis. The magnitude of the field might vary with time according to any of the four
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p240f07final-ver1 - Physics 240 Fall 2007: Final Exam...

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