• RC circuit with unity gain at high frequencies and cutoff frequency 500 Hz.
• RL circuit with unity gain at high frequencies and cutoff frequency 5,000 Hz.
• Circuit with an op amp, resistors, and a capacitor with gain -10 volt/volt at high frequencies and cutoff frequency 500 Hz.
• Circuit with an op amp, resistors, and an inductor with gain -20 volt/volt at high frequencies and cutoff frequency 5,000 Hz.

RL Circuits: Problems 3, 4, and 5.
RC Circuits: Problems 21 and 22.

RC Circuits: Problems 21, 27, 30, and 32.
RL Circuits: Problems 5, 8, 15, and 19.

Hint for Problem 7.21:
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 v₁(t) and v₂(t). You will find that for large t, the voltages v₁(t) and v₂(t) do not approach 0, and this leads to "trapped" energy.