What term defines two or more coils connected in opposition that detect electromagnetic conditions?

The term that defines two or more coils connected in opposition that detect electromagnetic conditions is "Differential." In this configuration, the coils are arranged to measure variations in the electromagnetic field, allowing for the detection of small changes or anomalies in material properties.

By using this differential arrangement, the influence of external noise can be minimized, enhancing the sensitivity and accuracy of the measurements. This makes it particularly effective in applications where precise detection of flaws or material characteristics is required, as the differential setup can amplify signals from the test object while canceling out common noise.

In contrast, the other options do not describe this specific configuration. "Absolute" typically refers to a measurement that does not compare against another reference, while "Laminar" is associated with fluid flow rather than electromagnetic detection. "Flying probes" are related to a testing method that uses probes to test components on a circuit board, which doesn't apply to the definition involving coils connected in opposition.