test3tuth - 5/8“ Problem la(6 Write down Ampere’s law...

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Unformatted text preview: 5/8“ Problem la (6) Write down Ampere’s law which relates a B -field to the currents which generates it and —> explain what the terms mean. €6va mownd ‘4‘, AW Wig 2 {33,44L: #9211. (1"? Q‘Véj/avfdcm 7 Q Mamet 0L wit/W (j flZEVCE’Yl/M‘W- 1% (’02 Cum/PM C524» a? a; /5' 0m Ov/aA'C/ex/m W“ W Problem 1b A current generates a B -field, a current feels a force in a B -field, show that two parallel currents attract one another. (10) FZ'YSV] W M 131' LR PD: Z/JQEE.% ' I "7 2:74. . . 7 ‘ rW's Com .422) 12% MPQMW (4E {fuzz .‘ A. l: f .12 AIZXEH. QIZHX I; ’ ’5? 9' _ A ’\ A 2 Ag X )Q %: -- g ’ fiblzfi’ Z711 [2/9 Problem 2a What is the difference between a Coulomb E -field and a non-Coulomb E Qfield? Explain clearly. " ‘ (5) [4 Capt/00W é: file/COLL; WMQL 57.41 KQ'a/l’b‘bna/gy/ wMjQMH-QWCQ. d) QBCe/LEal “£— é r duczé 49 2‘ :2. D :2 D 1) Eli) 47750/21 /' —e,u [cm 9 mun—cammgWQ—cw ”‘ a? ’9 3 SWAuvsah‘ 6v LQJT/I'ow “ram é fax (3170—; (‘5 a) \ mu <fi\w—L i fE/xroAi 1 ’g'? a»? (06/) If F Ct‘YCu/va'au, Ev: aVOQULDJ ‘2 Mot Char , 2w? ' ,9 P .9; $625wa g A 4‘“ ”“87”; mam movie Problem 2b ‘ In an L-R circuit the characteristic time is given by T = %. Why do both L and R appear in this equation? _ x , k i am L.- R CCV'Cuja/l’; LXI: [Ea/L902»? (5) U m \i'D ”2/53” lolx‘ Sb» q QAYYM‘ ' file/S a cowards YA; all Ma or]? IT) L LA‘ c we Vu— ’ ZEL— ‘ CMWQM/fl" or“) R We l5 W¥(qu Chem 7” E K 2/2? Problem 2c In the circuit shown, what is the current when i) the switch is just closed, ii) a long time later. (10) Problem 3a In order to establish a current I in an inductor L, one needs to perform “a = lle 2 joules of work. Where does this energy go? (6) 5-}, 34% \‘M/QZ aka/bvsw‘w? 0;; g , {wage an cm; 34AM, Problem 3b How much Energy is stored in one m3 of the Earth’s field, BE = SOyT ? Why? Frau/r34 “(gt—é L12 d§3 \fEsfiszaudnzaz 4/ CL (10) - :5. ,— (Alv K's/“Db 1 _ L’fio A! Lo‘ziLC&)V ,___ am 2. P‘ ' ya dig 7//v\ /Mg (A; /{‘j/\ 522;} U {hm W 132.. 5‘ ”)3" 3"“ /“’ m a 2 ’ m awe 9:12; W .5254. :r/wa (VI/LP, pixéhfl’i} 5UP“) 5/? Problem 4a Shown are two circuits R In both cases the capacitor is charged to i Q before the switch is closed. Describe how the charge on each will vary as a function of time after the switch is closed. I é/g’ Problem 5a In the [CR circuit fed by an ac generator, you want to measure the current. Where would you attach an oscilloscope? Why? (6) Problem 5b In the circuit of Prob 5a if you vary the frequency of the generator why does the current become very small at both very high and very low frequencies? (TM CQWM 6W"? LCM r“—< Tum (10) ‘92; am: JEN ‘ ' ' rL 2 - {1*(WLZZU‘C) \ FIN w—eo _L_——>oo Cwfio 7 we 3 Problem 6a What is light? Problem 6b Light and sound fire both waves. List five differences between them. SOL/“Ad MW. (10) (mfilemeM/f/f mom 17% Pfiwm) AD Quad Cm vow; chwaz; @4—e’d—t‘m Spear/luv: Clair/L 340M!) Swat/(Lg; Cody SXID 20H2<£c20kwg lo “(O‘5H& )1» T6,) LDWT’MM T‘KQUWQJ Problem 60 In an electromagnetic wave, E=cB. Which field has the larger energy density (energy/m3)? Why? Z Rw- 63¢) 4/} : .1» go 6281 'E z (8) g/g, ...
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