Spring 09 Final Exam

# Spring 09 Final Exam

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Unformatted text preview: be a. greater b. less c. the same 26. (1 pt) The charge on the capacitor after a long time will be a. greater b. less c. the same 27. (1 pt) The time it takes the capacitor to charge will be a. greater b. less c. the same Name__________________________________ 28. Four identical bulbs are connected to a battery as shown at right. The switch is closed. A a. Rank the bulbs in order from brightest to dimmest. If two bulbs have the same brightness, indicate that explicitly. (3 pts) C B Switch (b‐c) Now the switch is opened. D b. Does the brightness of bulb B increase, decrease, or stay the same? Explain your reasoning. (2 pts) c. Does the brightness of bulb A increase, decrease, or stay the same? Explain your reasoning. (2 pts) 29. The south pole of a bar magnet moves toward a conducting loop, as shown. (The arrow indicates the magnet’s velocity. You’re looking edge‐on at the loop.) N S Find the direction of the induced current in the loop, and indicate it on the diagram. (3 pts) Name__________________________________ 30. In the region between two equal and oppositely charged plates 0.10 m apart the electric field is measured to be 1000 V/m in the downward direction. a. What’s the potential difference between the plates? (2 pts) b. Which plate is at the higher potential – the top plate or the bottom plate? (1 pt) 31. Blue light (λ=400 nm) incident upon two closely‐spaced slits produces the intensity pattern shown below. At the location on the screen indicated by the arrow (corresponding to m = 6), what’s the difference in path length between waves from adjacent slits? (You should get a number.) (2 pts) 32. Resistor A and resistor B are connected in series to a 12 V battery. The current through resistor A is measured to be 2.0 A, and the voltage across resistor B is measured to be 8.0 V. Find the values of each of the resistances. (4 pts)...
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## This note was uploaded on 09/15/2013 for the course PHYS 112 taught by Professor Cui during the Fall '08 term at UMBC.

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