# Mutual induction: Why is the current in the low reluctance magnetic core not in antiphase with the current in the primary coil?

Current in the primary coil generates a magnetic flux around the coil (affecting the low reluctance magnetic core, and also the secondary coil).

Knowing that the emf (or current) is induced in the 2nd coil is in antiphase with the current in the primary coil, my question is why isnt the emf/current induced in the magnetic core in antiphase with the one in the primary coil?

If it is induced by a smaller than proportional amount than that in the secondary coil, that is the eddy current; why is it in phase with the current in the primary coil while that current induced in the secondary coil is in antiphase with the primary coil?

• What CURRENT is in the core? May 6, 2017 at 13:49
• What is "reluctance"? May 6, 2017 at 14:02
• "Magnetic reluctance, or magnetic resistance, is a concept used in the analysis of magnetic circuits. It is analogous to resistance in an electrical circuit, but rather than dissipating electric energy it stores magnetic energy. In likeness to the way an electric field causes an electric current to follow the path of least resistance, a magnetic field causes magnetic flux to follow the path of least magnetic reluctance. It is a scalar, extensive quantity, akin to electrical resistance. The unit for magnetic reluctance is inverse henry, H−1." May 6, 2017 at 14:24
• (From wikipedia) May 6, 2017 at 14:25