Question

Without the coil being connected to a complete circuit, similar movement through a magnetic field will not produce current. This concept is supported by Faraday's law of electromagnetic induction, which states that a changing magnetic field can induce an electromotive force (emf) in a closed loop.

Answer 1

You are correct in your summary of Faraday's law of electromagnetic induction. Faraday's law states that a changing magnetic field within a closed loop of wire induces an electromotive force (emf) in that loop. This means that for current to be produced, there must be a closed conducting path—as an open loop would not allow for the flow of current.

In essence, movement through a magnetic field can generate an emf, but without a complete circuit, the charge carriers (such as electrons) cannot move continuously, and thus, no current flows. This principle is fundamental to many electrical devices, including generators and transformers, where changing magnetic fields are used to create electrical current in conductive materials.

To clarify, the key conditions for Faraday's law to produce current are:

1. The presence of a changing magnetic field.
2. A closed loop or circuit to allow current to flow.

If the circuit is incomplete (open), then although emf may be induced, there will be no current flow because the path for the charges is interrupted.