Exam 2 Resolution - Physics with Calculus II - Fall 2008 | PHY 2049, Exams of Physics

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PHY2049 Fall 2008 Exam II Name. Yer 4 Panther ID. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Vert ver 2 1) Inan L-R-C series circuit as shown, the current has a very small amplitude if the ac source 1) A rad oscillates at a very low frequency. Which circuit element causes this behavior? 7 a) the capacitor C b) misleading question ~ the current actually has a very large amplitude if the frequency is very low c) the resistor R d) the inductor L Verl Ver? 2) A flexible loop of wire lies in a uniform magnetic field of magnitude B directed into the plane of 2) ( A the picture. The loop is pulled as shown, reducing its area. The induced current i | e-- 0x5 ( ot oS o> BA a) flows downward through the resitor R and is proportioal to B2 Fad Q e-re b) flows upward through the resitor R and is proportioal to B2 ¢) flows downward through the resitor R and is proportioal to B so moO ‘> d) flows upward through the resitor R and is proportioal to B Ver vor 4. 3) A 16-mH solenoid inductor is wound on a form 0.80 m in length and 0.10 m in diameter. Acoilis 3) B E& tightly wound around the solenoid at its center. The coil resistance is 6.7 Q. The mutual inductance of the coil and solenoid is 89 HH. Ata given instant, the current in the solenoid is 890 mA, and is decreasing at the rate of 2.5 A/s. At the given instant, the magnetic energy of the solenoid, in J, is closest to: a) 3200 ‘b) 6300 c) 5600 d) 3900 e) 4800 2) B 4) If the voltage amplitude across an 8.50-pF capacitor is equal to oi V when the current amplitude 4) A through it is 3.33 mA, the frequency is closest to: a) 180 MHz b) 2.60 Hz ¢) 2.60 kHz d) 180Hz e) 180 kHz