ConcepTest Database: Electric Currents and Magnetic Forces - Prof. Carter Hall, Exams of Physics

Download ConcepTest Database: Electric Currents and Magnetic Forces - Prof. Carter Hall and more Exams Physics in PDF only on Docsity! Two identical current loops are placed one above other. If the currents flow in the directions indi- cated by the arrows, the two loops 1. repel. 2. attract 3. do not interact 4. exert torques on each other 5. push each other sideways ConcepTest Database; No. 1 CTID 3684 A negatively charged particle moves upward par- allel to a wire carrying a downward electric cur- rent. v In which direction is the magnetic force on the particle? 1. up 2. down 3. into the plane of the drawing 4. out of the plane of the drawing 5. left 6. right ConcepTest Database; No. 1 CTID 3771 ConcepTest Database; No. 3 CTID 3979 Two positive charges move parallel to each other as shown below. At the instant shown, in which direction is the magnetic force of q2 on q1? v x y z q1 v q2 1. The magnetic force is zero (v1 // v2) 2. +x 3. -x 4. +y 5. -y 6. +z 7. -z 8. other ConcepTest Database; No. 2 CTID 3711 Two parallel wires carry identical upward cur- rents, as shown. Does the Coulomb force be- tween the downward moving, negatively charged electrons in each wire cause a repulsive force be- tween the wires? II 1. Yes, but the magnetic force is stronger 2. Yes, but only if I is sufficiently small 3. No, moving charges don’t exert a Coulomb force on each other 4. None of the above ConcepTest Database; No. 3 CTID 3713 Current flows in the x-direction through a very large sheet that lies in the xy plane. The mag- netic field at the point P, some distance above the sheet, is in the I P x y z 1. +x direction 2. -x direction 3. +y direction 4. -y direction 5. +z direction 6. -z direction 7. it depends also on the y and z coordiates 8. it’s not along any of the axes ConcepTest Database; No. 2 CTID 3765 A negatively charged particle moves upward along the trajectory shown. As the particle moves by, in which direction does the magnetic field at P point? P 1. up 2. down 3. into the plane of the drawing 4. out of the plane of the drawing 5. left 6. right ConcepTest Database; No. 3 CTID 3769