13. Like a Hurricane. Four charged particles of equal magnitude are placed equidistant from point P and each moves with the same speed in the direction specified in the figure. What is the direction of the net magnetic field at point P due to these charged particles? A. Into the page B. Out of the page C. To the right D. Point P experiences no net magnetic field 14. Coax3. The cross-sections of three coaxial wires are shown in the figure together with their current directions. The current through the innermost wire is 21, while that of the middle and the outermost wires are both I. Loops X, Y and Z have radii 6R, 3R and R, respectively. Which of the following is TRUE about the magnetic field magnitudes along the aforementioned loops? A. Bx > By > Bz B. Bx > By = Bz C. Bx > Bz > By D. Bx = By < Bz X X e e PO e X X X e O O X

13. Like a Hurricane. Four charged particles of equal magnitude are placed equidistant from point P and each moves with the same speed in the direction specified in the figure. What is the direction of the net magnetic field at point P due to these charged particles? A. Into the page B. Out of the page C. To the right D. Point P experiences no net magnetic field 14. Coax3. The cross-sections of three coaxial wires are shown in the figure together with their current directions. The current through the innermost wire is 21, while that of the middle and the outermost wires are both I. Loops X, Y and Z have radii 6R, 3R and R, respectively. Which of the following is TRUE about the magnetic field magnitudes along the aforementioned loops? A. Bx > By > Bz B. Bx > By = Bz C. Bx > Bz > By D. Bx = By < Bz X X e e PO e X X X e O O X