Solenoids as Controllable Electromagnets

A solenoid is a tightly wound coil of insulated conducting wire. It acts as an electromagnet, and its magnetic field comes from the combined field of each turn in the coil.

In an ideal solenoid, the magnetic field inside is almost uniform and points along the solenoid axis. The magnetic field out...

A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil.

The turns can be picturized as a stack of closely spaced coaxial circular wires. Thus, a current-carrying solenoid generates a magnetic field equal to the sum of the magnetic field due to each turn.

If the fingers curl a...