Question

The coil of wire in the center of the screen encompasses an area through which magnetic field lines pass, so there is a magnetic flux through those coils. With the magnet stationary, is this magnetic flux producing any flow of current or potential difference?

Answer 1

With a stationary coil in a stationary magnetic field, no change in magnetic flux occurs, so no induced emf or current is produced in the coil, in compliance with Faraday's Law of Induction.

Step-by-step explanation:

When a coil of wire is subjected to a magnetic field but neither the coil nor the magnetic field is moving, there is no change in magnetic flux, and hence, no induced emf or current flow occurs. According to Faraday's Law of Induction, it is the change in magnetic flux that will induce an emf, and in turn, if a path is available, induce a current. The necessity for a change could be the result of either the magnetic field's strength changing, the area through which the field lines pass changing, the coil moving, or the angle between the field and the coil changing.

An example to illustrate this phenomenon is when a conducting plate passes between the poles of a magnet. As the plate enters and exits the magnetic field, the change in flux produces an eddy current. However, when the plate is completely within a uniform magnetic field and is not moving, no current is induced, which is directly related to the stationary condition asked about in the student's query. Magnetic flux will only result in induced currents and potential differences when the flux through the coil changes due to the coil's or the magnetic field's motion.

Answer 2

No, the coil will produce no flow of current or potential difference.

Step-by-step explanation:

Magnetic field flux is the number of magnetic field line passing through a given area. It depends on the area and the magnetic field strength through this area. For electromagnetic induction to occur, there must be a constantly changing magnetic field. This is according to Faraday's law of electromagnetic induction that states that the induced EMF is directly proportional to the rate of change in flux ΔФ/Δt, and is also proportional to the number of turns on the coil. A changing magnetic field will lead to a break in the flux linkage, which induces current or potential difference on the coil. A stationary coil through a magnetic filed will therefore produce no electric flow of current or potential difference on the coil.