Problems 21 and 22.
Hint for Problem 7.22:
Combine the series capacitors into an equivalent capacitor.
Refer to Section 6.3 to determine the
initial voltage on the equivalent capacitor.
Then find i(t), which will allow you to find
v_{1}(t) and
v_{2}(t).
You will find that for large t,
the voltages v_{1}(t) and
v_{2}(t) do not approach 0, and this
leads to "trapped" energy.