HSC Physics Practice Exam 2026 – The All-in-One Guide to Master Your Exam!

The principle of Faraday's law outlines how a change in magnetic flux through a closed circuit induces an electromotive force (emf). Each statement first describes a part of this principle.

Induced emf is related to the flux change, which means that when the magnetic flux through a coil changes, an emf is induced in the coil. This is foundational to Faraday’s law. The relationship between the induced emf and the rate of change of flux is also a critical aspect; specifically, the induced emf is directly proportional to how quickly the magnetic flux is changing. Similarly, the ability for a changing magnetic flux to induce an emf is a key point of Faraday’s observations.

However, the second statement suggests the presence of current flows regardless of circuit conditions. This is not consistent with Faraday’s law because the flow of current does depend on the circuit conditions, such as whether the circuit is closed and the resistance of the circuit. If the conditions are not suitable, even if an emf is induced, current may not necessarily flow. Thus, this statement does not accurately depict Faraday's law and is the correct choice for what does NOT describe the principle.