Under which condition the current will lag behind the voltage? Explain.
(i) f = `f_(r) " "`(ii) f `lt f_(r) " "` (iii) f `gt f_(r)`

Explanation

To determine under which condition the current will lag behind the voltage in an LCR circuit, we need to analyze the behavior of the circuit at different frequencies relative to the resonant frequency \( f_R \).

### Step-by-Step Solution:

1. **Understanding Resonant Frequency**:
The resonant frequency \( f_R \) of an LCR circuit is given by the formula:
\[
f_R = \frac{1}{2\pi\sqrt{LC}}
...