In a transformer, the flux in the core cuts both the primary and which other coils?

In a transformer, the magnetic flux generated in the core is essential for the operation of the device, as it facilitates the transfer of energy from one coil to another through electromagnetic induction. The primary coil, when energized with an alternating current, generates this magnetic flux.

The flux that traverses the core indeed also cuts through the secondary coil. This interaction induces an electromotive force (EMF) in the secondary coil, which is what enables transformers to step-up or step-down voltage levels between the primary and secondary windings, depending on the turns ratio.

While there can be additional winding coils in some transformers—like tertiary, feedback, or load coils—none of these are considered standard components in every transformer configuration. The fundamental relationship of a transformer is centered around its primary and secondary coils, with the secondary coil being the one that directly interacts with the primary's magnetic field to transfer power.

Thus, the answer focuses on the primary and secondary coils, as they are the basic operational components of a transformer. The secondary coil's involvement is what allows a transformer to function effectively as a means of voltage transformation in electrical systems.