Solenoid

• A solenoid is a coil of wire
• You can increase the strength of a magnetic field that a wire produces by wrapping the wire into a coil, called a solenoid
• This happens because the field lines around each loop of wire line up with eachother
• This results in lots of field lines pointing in the same direction, which are very close to eachother. This makes the field stronger
• The magnetic field is strong and uniform inside but outside it is just like the one of a bar magnet
• You can increase the field strength by adding an iron core, this becomes an induced magnet
• If you stop the current, the magnetic field disappears, as it can be turned on and off