In the circuit shown in Fig. E25.30, the 16.0-V battery is removed and reinserted with the opposite polarity, so that its negative terminal is now next to point a. Find (a) the current in the circuit (magnitude and direction); (b) the terminal voltage Vba of the 16.0-V battery; (c) the potential difference Vac of point a with respect to point c. (d) Graph the potential rises and drops in this circuit (see Fig. 25.20).
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