Air Cored Solenoid is formed on a strong moulded plastic bobbin and is used in several experiments or for any time a magnetic field is required of known field strength.  It can be mounted over the 'Magic Eye' tube for the Mass of Electron experiment, or used for making the IEC Current Balance apparatus, or used for calibrating the Hall Effect apparatus.

It contains 660 turns of copper wire and can carry about 5 amps maximum current. The wire terminates to 4mm socket head terminals.