PHYS227N S13 COOK Test 2 Practice Test

PHYS227N S13 COOK Test 2 Practice Test - 9000565...

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Unformatted text preview: 9000565 W%@UK\CC (N6? \N NUDE/62} OLD DOMINION UNIVERSITY PHYSICS 227N/232N, Universifl Physics I Spring 2003 Second Examination 10:00 am - 10:50 am Wednesday 05 March 2003 Room 100, OCNPS PROFESSOR: Dr. D. C. Cook Answer all 3 questions: Each question is worth different marks. Full marks will only be given if complete working is shown. All questions should be answered on the examination paper. If more space is required, attach sheets to paper. Text book may not be used. This examination will be 15% of the total course assessment. Honor Pledge Signature Candidate's Name SSN CONSTANTS AND E UATIONS :30=8.8510'12C2N'1m'2 1nC =10'9 C 111C =10'6 C k =1/41t$o=9.0109Nm2C'2 Q=CV Fe=(kq1q2/r2) 1* V=IR E=(kq1/r2)l‘ P=VI U =kCI1CI2 /r R=pl/A V =kq2/r (DE = El E.dS = q/Eo 1 . CAPACITORS (3O Marks) A combination of resistors and capacitors connected in a circuit is shown in Figure 1. The potential difference of 18.0V is placed across the combination to ground as shown. V=18.0V 6.00 9 WSfiWV .6DOpF Capacsrw (I 3.00 (2 25.st 3.00“]: (£59616 “1%" Figure 1 When the switch S is OPEN calculate: The potential difference (or voltage drop) between points a and b. (10 marks) (a) ANSWER Calgary: has «he Gummy: +0 Slot: WA 916::me cmwgc WV: USCG! f0 maiwimim a (msmm alah‘m bemmn CMW'm/fl' (”lo-JO and \Iofinfie. 2. Capacitance (Total 32 Marks) 2(a) In words, explain what a capacitor is. Also explain the following. When a piece of dielectric material is placed between the plates of a parallel plate capacitor, its capacitance is found to increase. Explain how this change comes about. (6 Marks) 2(b) What is the equivalent capacitance of each of the two circuits shown below. In each circuit the capacitance values are C1: 9.6 pf C2: 7.6 pf. C3= 2.6 pf. (6+6=12 Marks) 0) —-||—||—l|-— ANSWER: Ctot = units = C (ii) 2 C3 ANSWER. Ctot = Continued Page 6 2(c) (i) What is the equivalent capacitance of the combination shown in the figure below (8 Marks) ANSWER F 10/,4fl 100\/ “I 6 (2 LL/ufl )1 2(0) (ii) What is the charge on each capacitor in the above Figure? (6 Marks) ANSWERS: Q4 = C Q5 = C Q10 = _______ C Working for Q 2. End Q 2. 3. CIRCUIT ANALYSIS (Total 34 Marks) The circuit shown in the figure below contains 4 resistors and two batteries whose values are:- R1=6Q, R2=3§2, R3=8§2, R4=4Q, El=6V, E2=12V. Calculate the current flowing through each resistor. Figure 2 ANSWERS: OLD DOMINION UNIVERSITY PHYSICS 227N/232N, Universifl Physics Fall 2009 Second Examination 12:00-lz45 pm Wednesday 21 October 2009 Room 142-144, OCNPS PROFESSOR: Dr. D. C. Cook FULL WORKING OR JUSTIFYING STATEMENTS ARE NEEDED TO OBTAIN FULL MARKS. Make sure units are included with each answer. All questions must be answered on the examination paper. Text book may not be used. This examination will be 12% of the total course assessment. Honor Pledge Signature Name UID CONSTANTS AND E UATIONS so = 8.8510'12 CZN" m-2 1nC =10'9 c 1110 =10'6 C k =1/47tao=9.0109Nm2C'2 Q=CV F'= Eq Fe = (k qlqz/rz) 1‘ Circumference of Circle C= 21tr E = (k q] /r2) r Area of Circle A= 1tr2 U = k Q1q2 /r Surface area of a sphere AS = 4an V = k q; /r Volume of a sphere V= (4/3)*(TEI‘3) (DE = I E.dS = q/ao E = V/d K = 1/2 mv2 V = IR P = VI UE = qV R = pl/A Electronic Charge e = -1.60219 x 10"9 C Electron mass me = 9.109 x 10'3' kg Proton mass mp = 1.672 x 10'27 kg 3. CIRCUIT ANALYSIS (Total 35 marks) In the circuit shown in Figure 2, calculate: (a) the current in the 3.00 9 resistor. (8 marks) ANSWERS: Current = (b) The unknown emf’s 81 and 82 (18 marks) ANSWERS: 81 = 82 = (c ) the unknown resistor R (9 marks) ANSWERS: R = 6.00 9 $5.00 A Figure 2 2. OHM’S LAW and RESISTANCE (Total 35 Marks) 2(a) You apply a potential difference of 4.50 volts between the ends of a wire that is 2.50 m in length and 0.654 mm in radius. The resulting current through the wire is 17.6 A. What is the resistivity of the wire? Don’t forget the units. (15 marks) ANSWER 2(b) You are asked to wind a heater coil out of nichrome wire. Nichrome wire has a resistance per unit length of 1.60 Q/m. The heater must have a power rating of 45 W and is to be placed in series in a circuit with a 12 V battery. What length of nichrome wire will you use? (20 marks) ANSWER m. When the switch S is CLOSED calculate: (b) The potential difference between points b and ground. (10 marks) ANSWER (c) How much charge flows through the switch S when it is closed? (10 marks) ANSWER ...
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