B C 土井 Figure 1 Figure 2 N y H Figure 3 Z Figure 4 1. Figure 1 shows a representation of a long, straight wire carrying a current in the direction indicated. The wire and points A, B, and C are all in the same plane. At which point(s) in the figure will there be a magnetic field that is directed into the page? 2. If the field at point A in Figure 1 has a magnitude of 60 μT, the field at point C will be... a) 15 μT b) 30 μT c) 60 μT d) 120 μT e) 240 μT 3. If the field at point B in Figure 1 has a magnitude of 60 μT when the current in the wire is 4.5 A, what is r? 4. Figure 2 shows a path around two wires with currents in opposite directions. How would you calculate the value of f B. di for that path? α) μο 11 12 b) μο (11 - 12) c) Ho (I1 + I2) d) μο (12 - Ι1) 5. In Figure 3, the central dot represents a straight wire that is perpendicular to this page. The other parts of the diagram show compass needles. What direction is the current in the wire? b) Out of the page c) There is no current. a) Into the page 6. Figure 4 shows a representation of a conducting loop carrying a clockwise current in a region where there is a uniform magnetic field directed to the left. If the conducting loop is free to move, it will tend to rotate. Which axis is parallel to the axis of rotation of the loop? 7. If the length of one side of the square loop in Figure 4 is 20 cm, what is the magnetic flux through the loop due to an external field of strength B = 45 mT? 8. Recalculate your answer to Question 7 for the situation after the loop has reached its equilib- rium position (after rotating as predicted in Question 6).