As the coil spins, the current is constantly changing (Direction / Magnitude / Both)?

When a coil of wire spins in a magnetic field, the current induced in the coil experiences changes in both magnitude and direction.

To understand why, let's look at the concept of electromagnetic induction. When a coil of wire is located in a changing magnetic field, it experiences a change in magnetic flux. According to Faraday's law of electromagnetic induction, this change in magnetic flux induces an electromotive force (EMF), also known as a voltage, in the coil. This induced voltage drives a current through the coil.

As the coil spins, the magnetic flux passing through it changes. This change in flux is due to the varying orientation of the coil with respect to the magnetic field. As a result, the induced voltage and consequently the current in the coil change.

Firstly, the magnitude of the current changes because the induced voltage depends on the rate at which the magnetic flux changes. The faster the coil spins or the stronger the magnetic field, the higher the rate of change of flux, and hence, the greater the induced voltage and current.

Secondly, the direction of the current changes due to the right-hand rule. According to the right-hand rule, if you point your right thumb in the direction of the magnetic field and your fingers in the direction of the coil's motion, the direction of the induced current in the coil is perpendicular to both the field and motion directions. As the coil rotates, the relationship between the coil and magnetic field changes, causing a corresponding change in the direction of the induced current.

Therefore, as the coil spins, the current induced in the coil is constantly changing both in magnitude and direction due to the changing magnetic flux.