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5.e-kot.An electron is initially at the origin with a velocityv=v0ˆı. If there is a uniformmagnetic fieldB=B0ˆk, what is the trajectory of the electron?6.p-kot.Consider a proton with a velocityv=v0ˆkentering a uniform magnetic fieldB=B0(ˆı+ ˆ). What is the cyclotron radius?A.√2mpv0eB0B.mpv0eB0C.mpv0√2eB0D.mpv02eB0E. deleteA – 4
Second Long ExamFirst Semester, AY 2016–2017Physics 727.I-kot.Consider a quarter-circle wire with radiusRandcurrentIdirected as shown. If there is a uniform mag-netic fieldB=B0(-ˆk), what is they-component of thenet magnetic force on the wire?8.Torque and B-eans.A loop carries a currentIas shownand is immersed in a uniform magnetic fieldB=B0ˆ.What is the direction of the torque on the loop?
Second Long ExamFirst Semester, AY 2016–2017Physics 729.Loop-ception.Consider a current-carrying loop placedinside a long solenoid as shown. Which of the followingisTRUEabout the loop?A. It is in unstable equilibrium.B. It has a minimum potential energy.C. It experiences a maximum torque.D. It will rotate about the axis of the solenoid.E. deleteSolution:The loop experiences no torque, thus it will not rotate about the axis of thesolenoid. The magnetic dipole moment and magnetic field are anti-parallel. Thus, it isat unstable equilibrium.10.Paano ako lulugar?Consider two bar magnets and four compasses whose directions areindicated as shown. From left to right, what are the indicated polarities?A – 6
Second Long ExamFirst Semester, AY 2016–2017Physics 72For the next two items, consider four infinitely long, straight wires carrying the same currentIwith directions as shown. Point P is at the center of the square with side lengthS.