Which type of equipment is used to induce magnetization indirectly and create a circular magnetic field?

The type of equipment used to induce magnetization indirectly and create a circular magnetic field is the central conductor. This equipment works by allowing an electric current to flow through it, which generates a magnetic field. The circular configuration of the current leads to the establishment of a circular magnetic field around the conductor. This aspect is particularly useful in magnetic particle inspection, as it enables effective detection of surface and near-surface flaws in a workpiece.

In contrast, the other equipment options have different functionalities or applications. A magnetic yoke is primarily used to create a magnetic field directly in components by clamping onto them, while a magnetizing coil typically generates a magnetic field around an object, but not necessarily in a circular pattern. Prods are often used to connect to a workpiece for direct magnetization but do not generate a circular magnetic field in the same manner as a central conductor.