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University of the PhilippinesCollege of SciencePhysics 72Set ASecond Long ExamFirst Semester, AY 2014–2015Name:Instructor:Section/Class Schedule:Student Number:Course:College:
Second Long ExamFirst Semester, AY 2014–2015Physics 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.We are CLOSED.Which of the following statements is/areTRUEabout the net magneticflux through a closed surface?I. It is dependent on the surface area of the closed surface.II. It is proportional to the enclosed number of magnetic bars.III. It is always equal to zero.A. I onlyB. III onlyC. I and III onlyD. II and III onlySolution:Gauss0s Law for Magnetic Field2.Bar.A straight wire with massmand lengthLcarries currentIas shown in the figure.Which of the following magnetic fields will result to a zero net force on the wire?ˆA – 2
Second Long ExamFirst Semester, AY 2014–2015Physics 723.CharCharge.What is the charge of the particle?