What formula is used to calculate the inductive reactance of a test coil?

The inductive reactance of a test coil is calculated using the formula (X_L = 2\pi fL), where (f) represents the frequency of the alternating current and (L) is the inductance in henries. This formula demonstrates how inductive reactance increases with both frequency and inductance.

In the context of Eddy Current Testing (ET), understanding inductive reactance is crucial, as it affects the coil's interaction with the material being tested. A higher reactance means that the coil will oppose changes in current more strongly, which can impact the measurements and interpretations made from the Eddy Current signals. Using the correct formula ensures accurate assessments in detecting flaws or inconsistencies in conductive materials.

The other options provided do not correctly represent the relationship between inductive reactance, frequency, and inductance, making them unsuitable for calculating the inductive reactance of a test coil.