In the circuit shown in Fig. E25.30, the 16.0-V battery is removed and reinserted with t...

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 V_ba of the 16.0-V battery; (c) the potential difference V_ac of point a with respect to point c. (d) Graph the potential rises and drops in this circuit (see Fig. 25.20).