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University of the PhilippinesCollege of SciencePhysics 72Set ASecond Long ExamFirst Semester, AY 2015–2016Name:Instructor:Section/Class Schedule:Student Number:Course:College:
Second Long ExamFirst Semester, AY 2015–2016Physics 72INSTRUCTIONS:Choose thebestanswer and shade the corresponding circle onyour answer sheet. To change your answer, cross-out and sign your original answer andthen shade your new answer. No computational devices allowed (e.g. calculators, mobilephones). Any form of cheating in examinations or any act of dishonesty in relation tostudies, such as plagiarism, shall be subject to disciplinary action.Following instruc-tions 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.NesTorque Bareza Jr.A currentIflows througha circular loop lying on thexy-plane as shown. A uni-form magnetic field is directed along the +z-direction.What will happen to the loop if it is given a very smalldownward force as shown?A. The loop will oscillate.B. The loop will rotate 180◦about thex-axis.C. The loop will rotate 90◦about thex-axis.D. The loop will not move.2.CycloTRUEn.A charged particle with velocityv=vˆıenters a region with uni-form magnetic fieldB=Bˆand moves in a circular path. Which of the followingstatements about the particle isTRUE?3.Cyclotechnics.A particle of massmand chargeqenters a region with uniformmagnetic fieldBand follows the trajectory P as shown. Another particle with mass2mand charge-2qenters the region with the same velocity and from the same originas the first one. Which trajectory will most likely be followed by this particle?A – 2
Second Long ExamFirst Semester, AY 2015–2016Physics 724.Adik.A wire with a current along the +y-direction is under the influence of a uniformmagnetic field along the +z-direction. Along what direction does the magnetic forceon the wire segment point?5.Pole-pole.Three bar magnets are arranged in a stable configuration NE-TS-OR asshown. The north and south poles are labelled N and S, respectively, while E, T, Oand R are of unknown polarities. Which of the following statements isALWAYSTRUE?