12.4 Solenoids

Electromagnetic

Any device that produces a magnetic field as a result of an electric current.

Solenoids

When the wire is wound into a coil containing several loops

As current increases, field strength…

INCREASES

The greater the number of coils, the _____ the field strength

STRONGER

The more ferromagnetic the material within the coil, the _____ the magnets strength

HIGHER/STRONGER

As diameter _____, magnetic field strength ______

As diameter INCREASES, magnetic field strength DECREASES

Right Hand Rule #2 — Solenoids

The fingers of your right hand wrap around the coil in the direction of the conventional current, while your right thumb points in the direction of the north magnetic pole of the coil.