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University of the PhilippinesCollege of SciencePhysics 72Set AFirst Long Exam (Makeup)First Semester, AY 2016–2017Name:Instructor:Section/Class Schedule:Student Number:Course:College:
First Long Exam (Makeup)First Semester, AY 2016–2017Physics 72INSTRUCTIONS:Choose thebestanswer and shade the corresponding circle on your answersheet. To change your answer, cross-out and sign your original answer and then shade yournew answer. No computational devices allowed (e.g. calculators, mobile phones). Any formof cheating in examinations or any act of dishonesty in relation to studies, such as plagiarism,shall be subject to disciplinary action.Following instructions is part of the exam.Useful formulas:AreaVolumeSphere (radius=r)4πr243πr3Cylinder (radius=r, height=h)2πr2+ 2πrhπr2hsin(π/3) = cos(π/6) =√3/2cos(π/3) = sin(π/6) = 1/2sin(π/4) = cos(π/4) =√2/2Useful constants:e-1.60×10-19Cme9.1×10-31kg08.854×10-12C2/Nm2k8.988×109Nm2/C21.Tatsulok.Three charges are at the corners of an equi-lateral triangle of side length0.5 mas shown. What isthe location of the net electric field produced by thesecharges at the center of the triangle?A.+x-directionB.-x-directionC.+y-directionD.-y-directionSolution:fields equal magnitude; for charges on the x-axis, x-components cancel2.
X.Anegativecharge of magnitudeQis uniformly distributed along the+y-axis betweeny= 0andy=las shown. Which of the following correctly gives thex-component of thenet electric field at pointP?A – 2
First Long Exam (Makeup)First Semester, AY 2016–2017Physics 72Zl0ydy(x2+y2)3/2Zl0ydy(x2+y2)3/2Zl0xdy(x2+y2)3/2Zl0xdy(x2+y2)3/2dE=kQldyx2+y2(1)x-component:dEx=-dExpx2+y2(2)3.-QC.Charge-Qis uniformly distributed around a quarter circle of radiusrwith its centerof curvature at point P, as shown. What is thex-component of the net electric field at pointP?dE=kr2Q2πr·14rdθ(3)A – 3
First Long Exam (Makeup)First Semester, AY 2016–2017Physics 72x-component:Ex=Zπ20dEcosθ(4)4.Tatlong hindi bibe.Three identical conductors X, Y, and Z of initial charges+4q,-8q,and-2q, respectively, are brought into contact. A point charge+6qis brought near, butnot in contact with, conductor X as shown. The conductors are then separated from eachother while the point charge is still near X. Which of the following is a possible final chargedistribution for each conductor?A – 4
First Long Exam (Makeup)First Semester, AY 2016–2017Physics 72
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Physics, Electric charge, Energy density, Wire, College of Science, Capacitor Area Charge