Non-Destructive Testing (NDT) Practice Test

What type of magnetic field is produced by the circular coil of the test bench?

1. Radial

2. Transversal

3. Longitudinal

4. Circular

The correct answer is: Longitudinal

A circular coil generates a magnetic field that is oriented along the axis of the coil. When current passes through the circular coil, it creates lines of magnetic force that emerge from one end of the coil and re-enter at the other end, resulting in a magnetic field that runs lengthwise through the center of the coil. This is known as a longitudinal magnetic field. In contrast, radial fields would emanate outward from a central point, while transversal fields would be oriented perpendicular to the primary direction of the coil. Circular fields would imply a magnetic field that wraps around or follows the path of the coil, but in the context of NDT and common terminology, it does not describe the classical longitudinal field produced by such coils. Understanding these distinctions is crucial in applying Non-Destructive Testing techniques effectively.