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University of the PhilippinesCollege of SciencePhysics 72Set AFinal ExamFirst Semester, AY 2015–2016Name:Instructor:Section/Class Schedule:Student Number:Course:College:
Final ExamFirst Semester, AY 2015–2016Physics 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.what a qt!Anegativetest charge is placed a distancerfrom apositivechargeq. Which ofthe following statements is/areTRUEregarding the electric field ofq,E, and the electricforce,Ft, on the negative test charge?I.Ftis in the same direction asE.II.FtandEare in opposite directions.III. Atr,|E| ∝ |Ft|.Solution:II and IIIA – 2
Final ExamFirst Semester, AY 2015–2016Physics 722.Moligoyong arrow!Shown are the electricfield lines due to three point charges X, Y, andZ. Which of the following statements isTRUEabout the direction of the electric field vector atpoint P and the nature of the charges?3.diPole McCartney.An electric dipole is immersed in auniform electric field as shown. Which of the followingstatements isTRUEregarding the dipole’s motion?A – 3
Final ExamFirst Semester, AY 2015–2016Physics 72For the next three items, consider a solidconduct-ingsphere, with charge-2Qand radiusR, en-closed in a rectangular conductor, with charge+Q,as shown.