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The resistances in Figs. 27-20a and b are all 6.6 2, and the batteries are ideal 10 V batteries. R3 R1 R2 Figure 27-20 (a) When switch S in Fig. 27-20a is closed, what is the change in the electric potential VR1 across resistor 1? V (enter 0 if no change) (b) When switch S in Fig. 27-20b is closed, what is the change in the electric potential VR1 across resistor 1? V (enter 0 if no change)

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2 to 6 6 6 6-92 C-2.22

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