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13.Flux.A circular surface of radius 2 m, with unit normalvectorˆnshown in the figure, is immersed in a uniformelectric field of magnitudeE= 4 N/C. What is the elec-tric flux on the circular surface?A.8√3πNm2/CB.-8√3πNm2/CC.8πNm2/CD.-8πNm2/C14.Spheres.Consider the spherical conductors A, B, andC that are arranged as shown. The net charges of con-ductors A and B are+5Qand-2Qrespectively. Whatis the charge of conductor C so that the outer surface ofconductor A is+4Q?15.Mojo Jojo.Particles A, B, and C with chargesqA,qB, andqC, respectively, are arrangedas shown. For the given equipotential lines, which of the following is/areTRUEabout thecharged particles?I.qA=qB>0II.qA=qB<0III.qC<0A – 6
First Problem SetFirst Semester, AY 2015–2016Physics 7216.Russian Doll.A negatively charged conducting Russian doll consistsof spherical shaped head and base, each with radii of curvaturesRAandRBrespectively. LetVAandVBbe the electric potentials at head andbase respectively. Which of the following isTRUEabout the electricpotentials ifRA< RB?17.143Work.What is the work done by the electric field on a-4.0 Ccharge moving oppositeto the direction of a uniform electric field (3.0N/C) for a distance of0.10 m?A.+1.2 JB.+0.3 JC.-0.3 JD.-1.2 J18.GoodbyeLakas.Given the equipotential lines as shown,which of the following paths will give the least workdone by the electric field on apositivelycharged par-ticle?A – 7
First Problem SetFirst Semester, AY 2015–2016Physics 7219.Move it!Point chargesq1andq2are placed initially atx=aandx= 3arespectively.What is the work done by the electric field due toq2ifq1moves to pointx= 6aalong thepath shown?20.Electric Potential.Four identical chargesQare placed at the corners of a square of sides. What is the potential at the center of the square?A.4kQs2B.8kQ2√2sC.8kQ√2sD. zero21.Calculating Electric Potential.A chargeQis uniformly distributed on a rod of length2a.What is the potential at point P as shown?1(b-a)2-1(b+a)2