LE1 Samplex - 1SAY1819 (Answer Key).pdf - University of the Philippines College of Science Physics 72 Set A First Long Exam First Semester AY

University of the PhilippinesCollege of SciencePhysics 72Set AFirst Long ExamFirst Semester, AY 2018–2019Name:Instructor:Section/Class Schedule:Student Number:Course:College:

First Long ExamFirst Semester, AY 2018–2019Physics 72INSTRUCTIONS:Choose the letter of thebestanswer to each of the following questions.UseNo. 2 pencilonly to shade your answer to the exam. To change your answer, neatly eraseyour old answer and shade the new one. Take all the given variables to bepositive. Only non-programmable scientific calculators are allowed; all other electronic devices are prohibited.Any form of cheating in examinations or any act of dishonesty in relation to studies, such asplagiarism, shall be subject to disciplinary action.Following instructions is part of the exam. 1.You’re Grounded!An insulating rod of charge+Qwas brought close to a sphericalconductor of total charge-3Q. Afterwards, the sphere was grounded temporarily. Whatshould be the net charge of the sphere after cutting the ground? 2.Sometimes When We Touch.Consider three identical con-ducting spheresX,Y, andZas shown.SphereXwasbrought nearZ, and was separated afterwards. SphereYwasthen brought into contact with sphereZ, and was also sep-arated afterwards. Which of the following is a possible netcharge configuration after this process? Q2,-Q A – 2

First Long ExamFirst Semester, AY 2018–2019Physics 72 3.Saan darating.An electron is moving in a region of uniform field~E=E0(ˆı-ˆ). Whatis the direction of its acceleration?

First Long ExamFirst Semester, AY 2018–2019Physics 72 For the next two items, consider a +3.0 nCcharge at(-1.0 m,0.0)and a+4.0 nCcharge at(+1.0 m,0.0).