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Unformatted text preview: marhalim (mm56683) Homework 10 shih (57480) 1 This print-out should have 15 questions. Multiple-choice 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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