Spring 09 Exam 3

Tweentheplates 3pts bifa0010cchargeisreleasedfromth

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Unformatted text preview: nce across the 24 Ω resistor has been measured to be 12 V. a. Find the current through the 24 Ω resistor. (2 pts) 18 V b. Find the potential difference across the unknown resistor. (You should get a number). (2 pts) c. Find the value of the unknown resistance. (2 pts) 12 Ω 6.0 Ω Name__________________________________ 16. Find the equivalent capacitance of the arrangement of three capacitors in the diagram. (2 pts) 17. The capacitor in the circuit at right is initially uncharged. a. The switch is moved to position 1. On the axes below sketch a graph of the voltage measured by VP2 as a function of time. (2 pts) 30 µF 20 µF 50 µF b. After a while, the switch is moved to position 2. Sketch a graph of the current measured by CP1 as a function of time. (2 pts) 18. (2 pts) A magnet is free to rotate. a. Which end points towards the Arctic region of the earth? b. What type of magnetic pole exists in the Arctic region of the earth? 19. (2 pts) Draw vectors to represent the magnetic fields at the 3 locations represented by the dots. (Your arrows should represent both the directions and the relative magnitudes.) N S N S Name__________________________________ 20. In the circuit at right, all of the bulbs are identical, and the switch is initially open (as shown). a. Rank the bulb brightnesses, from brightest to dimmest, indicating equality if appropriate. If any bulbs don’t light at all, say so explicitly. (2 pts) (b‐c) Now the switch is closed. b. Rank the bulb brightnesses, from brightest to dimmest, indicating equality if appropriate. If any bulbs don’t light at all, say so explicitly. (2 pts) c. When the switch is closed, what happens to the brightness of bulb D? What happens to the brightness of bulb A? Explain your reasoning. (4 pts)...
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