20.24. Set Up: After completing one semicircle the separation between the ions is the difference in the diameters of their paths, or A singly ionized ion has charge Solve: (a) (b) The only difference between the two isotopes is their masses. and The diameter is 27.2 cm. (c) The separation is This distance can be easily observed. 20.25. Set Up: v and B are the same as in Problem 20.24. For The separation of the isotopes at the detector is Solve: and The separation of the isotopes at the detector is Reflect: The separation is large enough to be easily detectable. Since the diameter of the ion path is large, about 30 cm, the uniform magnetic field within the instrument must extend over a large area. 20.26. Set Up: The direction of is given by applying the right-hand rule to the directions of I and Solve: (a) The current and field directions are shown in Figure 20.26a. The right-hand rule gives that is directed to the south, as shown. and Figure 20.26 (b) The right-hand rule gives that is directed to the west, as shown in Figure 20.26b.
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