T3A_1420_fw09-10

# T3A_1420_fw09-10 - Name(please print Signature Student...

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Unformatted text preview: Name (please print): ' Signature: Student number: PHYS 1420 06 Test 3A Answer all questions in the space provided on this test paper. Use pen to write. F onnuiae are provided on the last page. 1. (6 marks) a. Calculate the magnitude and direction of the Coulomb force acting on 6 11C charge. b. What it the magnitude and direction of the electric ﬁeld present at the location of the 6 uC charge. 6 00 ,uC 1 50 l11C —-2.00 ,LLC I; o ——————— ——o———~o ..,,_———=x L 3 00 cm"““*\"2.00 cm+| \ 0' Fl 6 ec /§.0H5§‘Jf/J'nc5%/- WM _ ‘7 A354 ' F. ' ‘Zomo Ca) {(2 03M); 2. —€ 0—6 E : (fogfo?‘-g: [U {gosh/‘1 F: F— F; : 4(,_J’AJ ( 1:: rm? are-r NEGA—i'rué'xvoie‘) 2. (8 marks). Answer the following four multiple-choice questions. a. An “electron volt” (eV) is the: 1. force acting on an electron in a ﬁeld of magnitude of 1N/C 2. force required to move an electron 1 meter @energy gained by an electron in moving through a potential difference of 1 volt . energy needed to move an electron through 1 meter in an electric ﬁeld of magnitude of 1N/ C 5. work done when I C of charge is moved through a potential difference of 1 volt. b. Two large metal plates are charged (the same charge, opposite sign). The electric ﬁeld is the same at the following points. c. A potential difference of 90 mV exists between the inner and outer surfaces of a cell membrane. The inner surface is negative relative to the outer surface. How much work is required to eject a positive sodium ion Na+ (charge q x 1.6x10‘lg C) from the interior of the cell? 1.144x10'20J 2. -l4x10'2°J 1.4x10'20J .—1.4x10'20J 5. zero W: 7Al/ d. A neutral metal ball is suspended by a string. A positively charged insulating rod is placed near the ball, which is observed to be attracted to the rod. This is because: 1. the ball becomes positively charged by induction. 2. the ball becomes negatively charged by induction. 3. the number of electrons in the ball is bigger than in the rod. 4. electrons jump through the air from the rod to the ball @Lhe metal ball is polarized. [V = /[g HEWKJ/rifaxro'gV) :+A44 HO- O f 3. (6 marks) a. Three charges are at the corners of an equilateral triangle, as shown below. Calculate the electric potential at a point P midway between two charges on the x-axis. b. How much work is required to bring a fourth point charge of 6 uC from inﬁnity to point P? 3' 3.00nC a.) V=Z(4- ) [4:4 %)c‘:/,gs 91W, d’owo—qf‘ a: 0H0 "-2 l/ [f C was.” 7" . a.— “35114 5:4460 ‘40:“ -? +(57.0x10? 3'0 “u C j- 7, 20:9; (/_-— /mV+(.2.4U: new A} ail? r/QOKI5?j/l7o“31"‘0x’0hf7‘ 4. (3 marks) a. Find the equivalent capacitance of the capacitors in the circuit shown below. b. Find the charge on each capacitor. 6.0mm ) gmv may 10V a '- u- CO/F mm 2.9%; Air? no 94124ch ,5,” _, 5%p¢99;0f%‘c I C .. 1)) Ck4nac‘ op 7w Ito/«F (#F’Actﬁ-‘zr x; Q: at 4V: (gazto'éi—‘j/ﬁt’V): Jim-(Sic nu ORDER 7:: Fun: We? (#44064: an.) (3%,: 4,90 __, -O/u P {of pd-‘é-‘n no qub Alﬁe. ’ 71%.“ RDI'EZII‘UQC PrFﬁé‘gceyr-F Acaogr 13¢ch not: rﬁPAc 1"qu- _c_Q .2. 4 m5 r: 4%5t 5;” : {ama‘F : 3-0 V‘ —f @ﬂ’ﬂ‘gsf’) (10V) : Ad’x/o r (92;: r'ﬂ'oﬂ‘s Fj/3'0V) : -€ (who (‘_ T 5. (6 marks). An alpha particle (charge q = 26, mass m = 6.64%10'27 kg) is ﬁred at 3.0x107 m/s directly to the nucleus of gold (charge Q = 796), which remains stationary. The alpha particle is initially very far from the gold nucleus (distance approaching inﬁnity). How cIOSe does the alpha particle get to the gold nucleus before turning around? 6 : 1.6x10'19 (3. 22 6":64 k6,; + Pa = K} W54 2 @e)(?-?e/ ij +0 " 0"- k at _IY 271/.6HQ C) ...
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## This note was uploaded on 06/14/2010 for the course PHYS 1410 taught by Professor Wijngaarden during the Spring '09 term at York University.

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T3A_1420_fw09-10 - Name(please print Signature Student...

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