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ece159s_2003_qs03

# ece159s_2003_qs03 - Last Name First Name Student Nm'nber...

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Unformatted text preview: Last Name: ' ' First Name: Student Nm'nber: Tutorial Group: University of Toronto Department of Electrical and Computer Engineering ECE159S: Fundamentals of Electricity and Electric Circuits QUIZ 3 February.r 6, 2003 Duration: 25 minutes - Notes: QUESTIONS #1c and #2 ARE ON THE BACK or THIS PAGE. au-sssxm'?’ rm: 1. As shown in the ﬁgure below, daem- is a non-conducting sphere of radius A. This non-conducting sphere is uniformly ﬁlled with a total clurge of— 01. The non-conducting sphere is surrounded by a conducting shell carrying s charge + Q. The conducting shell has an inner radius of]! and an outer radius ofC. The spscebetweenthe spheremdshell, sswellasoutsidetheshell is vacuum. Determine the following: h. (1 mark} What is the electric ﬁeld inside the conducting shell? E=0 c. (3 marks) Find the surface charge density, a, on the outer surface of the conducting shell. I I 5 ‘ .‘ J7 H I 7 Q .r ; Q ‘ 0 run . E 0 mule s a. . 53% Mar swat £: Mm :> @me .-. {Q — Q Lnrsﬂ‘ " ' lew : 62.5,"; was/t,“ swig“ £457: ohsf+7= Q’s-Q. fang} :fdlefr‘ Lift”. C 1 "I. Qimsr 1 + Qt 2. A heater is formed using solid nickel-chromium wire that is 10 m long and 1 mm in diameter. If the heater is connected to 120 V determine the following (assume that the resistivity of nickel- chromiumis 1.0): 110*5 am): 5L (2 marks) The current in the heater. I: ”E” R: 3.5.; (“1’94””) .- £2302. . A 'n”( mom 1 b. (1 mark} The powdissipated bytheheater‘.’ F; V; = (129x17) : 1:28 W e. (2marks) Iftheheaterisusedtoheatamom, whatis theeosttohealtheroomfor30 daysifthe heater is on for 50% of the time and the cost of electricity is 5 cents per kWh? ' cod: (:122X30X2¥%7)(050X3’-;)(a.whom) 1‘ ’23-'30 ...
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ece159s_2003_qs03 - Last Name First Name Student Nm'nber...

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