Question

Transformers: The mutual inductance term is the opposite polarity as the self-inductance term if __________

A. The windings have the same number of turns.
B. The windings have opposite directions of current flow.
C. The windings are connected in series.
D. The windings are connected in parallel.

Answer 1

The mutual inductance term in transformers is the opposite polarity as the self-inductance term if the windings have opposite directions of current flow.

Step-by-step explanation:

The mutual inductance term in transformers is the opposite polarity as the self-inductance term if the windings have opposite directions of current flow (Option B).

Mutual inductance is the effect of Faraday's law of induction for one device upon another. In a transformer, the primary coil induces an emf in the secondary coil due to the changing magnetic field. The direction of the induced emf depends on the direction of current flow in the windings.

Therefore, when the windings have opposite directions of current flow, the mutual inductance term will have opposite polarity as the self-inductance term.