LR, RC and LCR Circuits: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of LR, RC and LCR Circuits. Understanding the underlying formula is key to arriving at the correct answer below:

At half-power frequencies, the power factor is \(\cos\phi = \frac{1}{\sqrt{2}}\), which gives \(\phi = \pi/4\).