Exam2Sol - Principles of Physics 11 PHYS 2112-11“! Exam...

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Unformatted text preview: Principles of Physics 11 PHYS 2112-11“! Exam #2 Lectures ti n 11 Fall ans Name Saidilhfl . H-..__.. You may use the values k = sacxlcg a meal, en = 3.35x1c‘l2c3m1n3 , and e = I_fiflx1fl‘19 c. 1. (10 points) A pmallelrplate capacitor is made with square plates of side 2.5flmm and has a plate separation of fl.3llilrnn1 . Ho‘s»r much charge would have to be put on the capacitor to achieve a voltage of 12.131»? '3' d 3 “I L _ I .5. M C1- fl- 9-?E-rc‘”'c;1 _ (JR-513'” no He's—rc- r» —r __.__-—.-..u- A ‘- NW1" 0.3eotrc'3m Get”; d = 1'. Wire“? ' lit-or! = lfleflal'm'ncl 2. {5 points) A capacitor is being charged with a current of 115m . Horar man}:r electrons are deposited on the capacitor in Sflflseconds‘? —s a: :51; : tram-324- <5?de : awn: CL . :_- g-qr-xo‘“al 3. {5 points) Copper 4-gauge wire, with a circular cross section, has a diameter of 5. 1 39mm . Horar long must a wire he to have a resistance offififlfl if copper has a resistiEty-ioflflilfl' [21:2 e fl 5: OIL. 5:]??qofl’l/l 1+ ‘52:? J P ‘“ L7 -rc'“5’_51 m IL: Blgrjablmr: 3i Lml 4. {It} points] Four charges form the corners of a square with a side length of 4.{lflcm . Three of the charges are lflflpc and one charge is -3.fll}p.C . What is the potential at the \Fente-E oil-the squarekifwe as: Lain at infinity? 3”.“ stern: fl 3#(-__ 5 .___.—--L '-"‘ i :- ___/—£ II/ P r— r~ dz 7 = LF'J'ID #1 9'5. V: £99-J0qfla 1' .Eufibqg'l’a a 0H 01" Afgqo'lm IMO if" ’i’ l- /Lf: '2'va 5. (It) points) An electric potential has the functional form Vtx.az}=ex2r+t3rz+txrz, wile: a, B, and Lareconstants. seam is the electric field vector Eu, 3', 2)? v: a at “- 2N aav V 3W2; " 9’s t. = vitae-194' 33%) +""(_s. stage +5371; 4' E (If?! 4'? 73') E: — ( integrates); "(0‘ TL? wk”) Q -(fie+3a 9* 6. {it} points) Three charges form the corners of an equilateral triangle with a side length of 3.flflcrn . Two of the charges are 5.0Un‘1C and one ofthe charges are -5.t}t}InC . What is the potential energy]r of this arrangement if we define PE=D when all charges are intinitelyfarfi'orn each other? a £Wm£ 7‘- "a. PE= he, _ lcg1'__br he ’3,qu "I: “F” “Tr-2Q: 0/ \o - --: 5733‘} ;a‘tum't (gate—Jo 3t)“ _ 5&6 fire“; a 3 Fb-xn‘% F": flat/ab" T. [lfl points] A charge of 2.?5n1C is at the point (-1-.Ufln1 , lfiflm} . 1|What is the potential at the point {2.03m , l.flt}n1) if we define V=fl at infinity? fa": lib-D M1”) r:3albm 23%“? r . e .1- .1 44¢ in V: kLfifi‘i‘tJD 10:,35" _: f C; 'ZJEM IV: 7. raven/l 3. [It] points} An RC circuit has a capacitor with a capacitance of 2.351;!” and an initial charge of l.flt}n1C . What resistance should be attached across the capacitor so that the capacitor will discharge to a final charge of UfffimC in itlflseconds? -i: '9‘, 13:43.5», A“, aqm=%_ ,ébafitnfi-t— ; r?” l: :_,___._*j:-JJE.S.....__..____ .. 't "t 'E‘l C In ( - serum: 9. [15 points] Consider the circuit shown below with the currents as shown. Assume the voltages and resistances are given. Determine three equations that could he used to solve for the currents. DD NOT SOLVE THEM! Just finti the equations. ii}. I: 15 points} Consider the circuit shown below. \ a} What is the current leathtg the battery? V} w, b) What is the current in the 4.1300 resistor? ’0' "TINA 0.73351. I: 18.344 H a) I: $43.23 fl - 0.7m. ISL - *- W gigaiullg'fi] q I 'J'Dfl. ' HO I = ISLDU~ $1.5m.- 3.13:4 " LLEDJL ...
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This note was uploaded on 01/23/2012 for the course PYSICS 2212 taught by Professor Jimguinn during the Spring '11 term at Georgia Perimeter.

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Exam2Sol - Principles of Physics 11 PHYS 2112-11“! Exam...

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