s04x1aan - 1 F 10 . 4 1 F 10 4 . 2 1 1 1 1 6 6 6 6 6 1...

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NAME PHYS-1200 PHYSICS II QUIZ 1 FEBRUARY 11, 2004 SOLUTIONS PART A. 1. B 5. C 2. E 6. B 3. B 7. B 4. E 8. C PART B . 1. a) q 1 q 2 q 3 q 4 All four contribute to the field at point P . The Gaussian surface plays no role in calculating the field at P . b) q 1 q 2 According to Gauss’ law, only the charges enclosed by the surface contribute to the net flux through the surface. 2. a) 100 W They are both connected to 120 V, so they dissipate their listed power. b) 25 W When in series, the bulb with the higher resistance dissipates more power. c) Less than 25 W When in series, there will be less than 120 V applied to the bulb. 3. a) INTO THE PAGE It must produce a field opposite in direction to that produce by i 1 , so it must be in the opposite direction. b) GREATER THAN i 1 It is farther from P , and it must produce a field equal in magnitude to that produced by i 1 .
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NAME PART C . 1. a) The charges on capacitors in series are equal q 2 = 2.4 ×10 -5 C b) The equivalent capacitance of the two capacitors in series is equal to F 10 4 . 2 V 10 C 10 4 . 2 6 5 - - × = × = = V q C , and 2 1 1 1 1 C C C + = , so F 10 4 . 2 4 . 0 F 10 4 . 2 6 . 0 F 10 4 . 2
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Unformatted text preview: 1 F 10 . 4 1 F 10 4 . 2 1 1 1 1 6 6 6 6 6 1 2----- = - = - =-= C C C C 2 = 6.0 10-6 F c) F 10 . 4 C 10 4 . 2 6 5 1 1 1-- = = C q V V 1 = 6.0 V d) U = qV = (2.4 10-5 C)(10 V) U = 1.2 10-4 J This could also be done with U = CV 2 , since q = CV . 2. a) Since the magnetic field is uniform, BA B = , so 2 4 2 1 m) 10 . ( Wb 10 . 4 - = = = R A B B B B = 1.3 10-2 T b) COUNTERCLOCKWISE The magnetic field from the solenoid points into the page within the loop, and it is increasing. The field from the current in the loop must point out of the page to oppose the increase. c) dt dB A dt BA d dt d B = = = ) ( E so 2 4 2 1 m) 10 . ( V 10 . 5- = = = = R A A dt dB E E E dt dB = 1.6 10-2 T/s d) R i E = , and = = = =---10 5 . 3 m 10 . 3 m) 10 . ( 2 m) 10 69 . 1 ( 2 4 2 5 8 1 A R A L R Then, = =--10 5 . 3 V 10 . 5 4 4 R i E i = 1.4 A...
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This test prep was uploaded on 04/18/2008 for the course PHYS 1200 taught by Professor Stoler during the Spring '06 term at Rensselaer Polytechnic Institute.

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s04x1aan - 1 F 10 . 4 1 F 10 4 . 2 1 1 1 1 6 6 6 6 6 1...

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