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Chap_22_23_Disc[1]

Chap_22_23_Disc[1] - 22-50 Consider the long straight...

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22-50: Consider the long, straight, current-carrying wires shown in Figure 22–39. One wire carries a current of 6.2 A in the positive y direction; the other wire carries a current of 4.5 A in the positive x direction. (a) At which of the two points, A or B, do you expect the magnitude of the net magnetic field to be greater? Explain. (b) Calculate the magnitude of the net magnetic field at points A and B. Picture the Problem: Two current-carrying wires cross at right angles and each produce a magnetic field. Strategy: The magnetic field produced by each wire is given by equation 22-9 and points in a direction given by the Right-Hand Rule (see figure 22- 20). The field directions produced by the 4.5-A current are shown at the left and right of the diagram, and the field directions produced by the 6.2-A current are shown at the top and bottom. The net magnetic field is the vector sum of the magnetic field contributions from each wire. Solution: 1. (a) The field directions indicated in the diagram indicate that the field contributions add at point A and subtract at point B. We conclude that the magnitude of the net magnetic field is greatest at point A.

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Chap_22_23_Disc[1] - 22-50 Consider the long straight...

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