8/01 In the HW for Aug 4, please drop Wolfson Chapter 32 #'s 36 and 64 and add the following two problems from Young and Freedman 11th Edition (these have also been added on the Unit 4 problems page). Also, in the MC of Old Test 4, do not study questions 11 and 12 -- we will not cover that topic this summer. GBA Y 31:60 You enjoy listening to KONG-FM, which broadcasts at 94.1 MHz. You destest listening to KRUD-FM, which broadcasts at 94.0 MHz. You live the same distance from both stations and both transmitters are equally powerful, so both radio signals produce the same 1.0 V source voltage as measured at your house. Your goal is to design an LRC radio circuit with the following properties: i) It gives the maximum power response to the signal from KONG-FM; ii) the average power delivered to the resistor in response to KRUD-FM is 1.00% of the average power in response to KONG-FM. This limits the power received from the unwanted station, making it inaudible. You are required to use an inductor with L = 1.00 microH. Find the capacitance C and resistance R that satisfy the design requirements. Y 32:47 A circular loop of wire can be used as a radio antenna. If an antenna with a diameter of 18.0 cm is located a distance of 2.50 km away from a from a source with a total power of 55.0 kW at a frequency of 95.0 MHz, what is the maximum emf induced in the loop? (Assume that the plane of the antenna loop is perpendicular to the direction of the radiation's magnetic field and that the source radiates uniformly in all directions.) Hint for Problem 32.47: This is a Faraday's Law problem, but with a radiated B field that is varying sinusoidally (so you can write B(t) as Bmax*sin(omega*t) and differentiate to get the maximum value of dB/dt). GBA 7/25 HW problem Wolfson Chapter 31 #33 part (d), assigned on Tue July 26, is poorly written. The problem intends to ask for the RATE at which work is being done by the agent pulling the bar. GBA 7/15 For the lecture on Mon July 18, please download the Definitions for Current and Resistance from our class web page and bring them with you to lecture. I will not write these definitions on the overhead as usual. Thanks. GBA 7/14 In the Old Tests available from the Noble Library Copy Center, page 5/6 of Test 2 has been switched with page 5/6 of Test 4. The correct Problem 1 of Test 2 is a partially-filled parallel plate capacitor. 7/12 In the Homework for July 13, please drop Ch 25:2 and add Ch 25:44 in its place. Thanks. GBA 7/06 The Old Tests, with solutions, are now available in the Noble Library Copy Center. 6/25 No Updates Yet