When there is no physical or electrical connection between the two coils yet energy is transferred from one coil to the other. The coils are said to be ______ coupled.

When there is no physical or electrical connection between the two coils yet energy is transferred from one coil to the other. The coils are said to be ______ coupled.

• A. Magnetically
• B. Capacitively
• C. Inductively
• D. Electrically

Answer: (C)

Inductive coupling is at work here: energy moves from one coil to the other through a changing magnetic field, with no physical or electrical connection between them. When current in the first coil varies, it creates a changing magnetic flux that links the second coil. This changing flux induces a voltage in the second coil (Faraday’s law), and if the second circuit is closed, power transfers via mutual inductance. Capacitively coupled would require energy transfer through an electric field between conductors, which isn’t the case here, and electrically or physically connected would mean a direct wire connection, which doesn’t exist. So the energy transfer without contact is best described as inductive coupling.

Inductive coupling is at work here: energy moves from one coil to the other through a changing magnetic field, with no physical or electrical connection between them. When current in the first coil varies, it creates a changing magnetic flux that links the second coil. This changing flux induces a voltage in the second coil (Faraday’s law), and if the second circuit is closed, power transfers via mutual inductance. Capacitively coupled would require energy transfer through an electric field between conductors, which isn’t the case here, and electrically or physically connected would mean a direct wire connection, which doesn’t exist. So the energy transfer without contact is best described as inductive coupling.