Question

1. in a low pass rl filter circuit, the inductor is placed

a in parallel with the output signal
b in parallel to the input signal
c in series to the input signal
d in series with the resistor

Explanation:

In an RL low - pass filter, the inductor is placed in series with the input signal. The inductor has an impedance \(Z = j\omega L\). For low frequencies (\(\omega\) is small), the impedance of the inductor is small, so most of the input voltage is across the resistor (output). For high frequencies (\(\omega\) is large), the impedance of the inductor is large, so most of the input voltage is across the inductor and little is across the resistor (output). If the inductor were in parallel (options a and b), it would not provide the frequency - dependent voltage division for a low - pass filter. Option d is incorrect because in a basic RL low - pass filter, the resistor is the element across which the output is taken, and the inductor is in series with the input (source - inductor - resistor - ground configuration).

Answer:

C. in series to the input signal