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Unformatted text preview: marhalim (mm56683) Homework 10 shih (57480) 1 This printout should have 15 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points The applied voltage across the plates of a 4 . 37 F capacitor varies in time according to the expression V app = V (1 e t/t ) , where t is in seconds, t = 1 . 95 s, and V = 7 . 54 V. Calculate the value of the displacement cur rent at t = 1 . 95 s . Answer in units of A. 002 10.0 points Assume that the power radiated by the tele vision transmitter uniformly fills the upper hemisphere. A UHF television with a single turn circular loop antenna of radius 10 cm requires a maximum induced voltage above 34 mV for operation. The speed of light is 2 . 99792 10 8 m / s. Find the distance d at which reception is lost from a 461 kW transmitter operating at . 16 GHz. Answer in units of km. 003 10.0 points The filament of an incandescent lamp has a 200 resistance and carries a direct current of 1 . 2 A. The filament is 3 cm long and 0 . 16 mm in radius. Calculate the Poynting vector at the surface of the filament. Answer in units of W / m 2 . 004 10.0 points In 1965 Penzias and Wilson discovered the cosmic microwave radiation left over from the Big Bang expansion of the universe. The energy density of this radiation is 2 . 11 10 14 J / m 3 . The speed of light 2 . 99792 10 8 m / s and the permeability of free space is 4 10 7 N / A 2 ....
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This note was uploaded on 03/22/2012 for the course PHYS 302L taught by Professor Tsoi during the Spring '10 term at University of Texas at Austin.
 Spring '10
 TSOI
 Physics, Work

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