Even though two coils do not share a common core, they can have some amount of mutual inductance.

Name: Even though two coils do not share a common core, they can have some amount of mutual inductance.
Brand: Quizplus
Rating: 4.9 (40 reviews)

Question

Quizplus · Accepted Answer

Mutual inductance can occur between two coils even without a common core due to the magnetic field of one coil linking with the turns of the other coil, inducing a voltage in the second coil when the current in the first coil changes.

Even Though Two Coils Do Not Share a Common Core