Midterm 2_Spring 2014-2015

Midterm 2_Spring 2014-2015 - EPVI'v-g Semester gall 14/15...

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Unformatted text preview: ..'-\ EPVI'v-g» Semester: gall 14/15 Date: April. 29, 2015 Time: 16:00 - 17:15 Department of Applied Physics College of Sciences University of Sharjah Physics.2 - (0143117) ' Midterm Exam II. (A) Name: WHEVY ................ ID Number: ................ . ..... Instructors Sections Lecture Time Select your section Dr. Kais Daoudi 4 TR 09 :30 -— 10 :45 52 TR 08:00 — 9 :15 3 MW 08 :00—9 :15 Dr. Abdallah Hamdan 54 TR 08 :00 - 09 :15 11 MW 09 :30 - 10:45 5 TR 12 :30 — 13 :45 Dr. Gehad Sadiek 2 MW 09 :30 — 10 :45 51 MW 12 :30 - 13:45 Dr. Hussain Elmahdi 53 TR 12:30 — 13 :45 Please read the followin instructions carefull : a) The exam is made up of two parts: Part I: 14 MCQ Part II: 2 Long Questions b) The exam consists of five pages including the cover page. c) Each student should have his/her won calculator. Please fill the following table after solving all MCQ QUESTION Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 ANSWER ~ _ Part-II. _ _ Quasitibn .1 (2516515022 2 Part-*1 .s flestioh 3 16 2 Part A - Choose the right ansvver for the following Questions : [one mark each) Q1. Let Q denote charge, V denote potential difference, and U denote stored energy. Of these quantities, capacitors in series and capacitors in parallel must have respectively the same: A. Q & V only B. V only C. U only D. Q and U only E. V and U only Q2. The effective area of each plate of a parallel plate capacitor is 2.1 m2. The capacitor is filled with neoprene rubber (k = 6.4). When a 6.0-V potential difference exists across the plates of the capacitor, the capacitor stores 4.0 pC of charge. Determine the plate separation of the capacitor. A) 3.0 x 10‘4 m B) 8.2 x 10‘5 m C) 7.2 x 10‘5 m D) 1.3 x 10*4 m E) 5.3 x 104 m Q3. The resistivity of gold is 2.44xIO'8 Elm at room temperature. A gold wire that is 0.9 mm in diameter and 14 cm long carries a current of 940 mA. What is the electric field in the wire? A) 0.046 Wm B) 0.023 Wm C) 0.09 V/m o) 0.036 Wm E) 0.053 V/m Q4. A 1.0-pF capacitor and a 2.0-pF capacitor are connected in series across a 1200—V source. The charge on each capacitor is A) 0.4 rnC B) 0.8 mC C) 1.2 mC D) 1.8 mC Q5. A certain wire has resistance R. Another wire, of the same material, has half the length and half the diameter of the first wire. The resistance of the second wire is: A) R/4 B) R/2 C) R D) 2R E) 4R Q6. A certain electric heater consumes .24 kW when it is connected to a 240-V line. What is the resistance of the heater A) 0.42 Q B) 2.4 S! C) 100 9 D) 1 Q E) 10 Q Q7. The circuit shown below has two resistors and one battery. If resistor R] is taken away, the current at resistor R2 R. A) Increases B) Decreases R2 C) Remains the same D) None of above Part B - Solve all the following Questions : Q1. For the circuit shown in the figure, all quantities are accurate to 2 significant figures. What is the value of the current [1, 12 and 13? (Smarks) 59 39 /( K QZ. The figure Shows a parallel plate capacitor of area A = 10.0 cm2 and a gap of separation 251, where d = 8 mm. It the gap in between the plates is filled With three dielectric materials (x1 = 22, K2 = 46, 163 = 59) as shown in, what is the equivalent capacitance in F? (Zmarks) ( _ A/2 A/2 I‘ ‘ 21:2. i we, ‘2' T“! w _ E! Q3. A nichrome wire is 11n long. and I x 106 m2 in cross-sectional area. When connected to a potential difference of 2V,_ a current of 4A exists in the wire. The resistivity of this nichrome is: (Zmarks) R=V/1:2/4=0.so R=pL/A p =RA/L=0.5 x3.]4x]x1045/1=5x10-7Q-m Q4. The emf and the internal resistance of a battery are as shown in the figure. If a current of 8.3 A is. drawn from the battery when a resistor R is connected across the terminals ab of the battery, what is the power dissipated by the resistor R? (Zmarks) Vab=£-(Ir+R)=95—8.3(5+R) P=IZR Useful formulas C = Q/V C = egA/d U 2 1/2CV2 U = I/2 QV C=kC0, Pk 80 V = R1 R=poA k=9x109 Nmlez c2 so 28.85x10"'2 N-m2 ...
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