Question

question 21
the correct formula for rl circuit time constant is ____.
○ $\tau = r/l$
○ $\tau = l \times r$
○ $\tau = l/r$
○ $\tau = (l/r) + 1$

Explanation:

In an RL (resistor - inductor) circuit, the time constant ($\tau$) is defined as the ratio of the inductance ($L$) to the resistance ($R$). This is a fundamental concept in the study of electrical circuits within the field of Physics (a subfield of Natural Science). By recalling the formula for the time constant of an RL circuit, we know that $\tau=\frac{L}{R}$.

Answer:

C. $\tau = L/R$ (assuming the third option is labeled C; if the original options have different labels, adjust the label accordingly, e.g., if the third option is labeled as the third circle - based option, state it as "The third option: $\tau = L/R$")