Chapter 23 3 Q23.16 The direction of the electric field is the direction in which a positive test charge would feel a force when placed in the field. A charge will not experience two electrical forces at the same time, but the vector sum of the two. If electric field lines crossed, then a test charge placed at the point at which they cross would feel a force in two directions. Furthermore, the path that the test charge would follow if released at the point where the field lines cross would be indeterminate. Q23.17 Both figures are drawn correctly. E 1 and E 2 are the electric fields separately created by the point charges q 1 and q 2 in Figure 23.14 or q and – q in Figure 23.15, respectively. The net electric field is the vector sum of E 1 and E 2 , shown as E . Figure 23.21 shows only one electric field line at each point away from the charge. At the point location of an object modeled as a point charge, the direction of the field is undefined, and so is its magnitude. Q23.18
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