Final answer:
The mutual inductance term has the same polarity as the self-inductance term when the windings have the same number of turns. Mutual inductance is essential in transformers for energy transfer and its unit is the henry (H), also affected by Lenz's law.
Step-by-step explanation:
The mutual inductance term is the same polarity as the self-inductance term if the windings have the same number of turns. Mutual inductance is a quantity that represents how a current in one circuit induces an electromotive force (emf) in a second circuit and is usually denoted by the symbol M. When transformers are involved, mutual inductance is crucial in the transfer of energy from the primary coil to the secondary coil. The polarity of the mutual inductance term is not only determined by the number of turns in the windings but also by the direction of the windings and how they are connected.
In the context of transformers and mutual inductance, Lenz's law is a fundamental concept that describes the direction of induced currents and emfs, ensuring the conservation of energy. The unit of mutual inductance, as well as self-inductance, is the henry (H), which quantifies the magnitude of these effects in a circuit.