0 a device made from a piece of iron that becomes magnetic when a changing current is passed through the wire that goes around it
Hence the cause of the commonly received opinion among telegraph engineers that for rapid work electromagnets must have short cores.
Many two-pole electromagnets show a tendency to bend together when the current is turned on.
On heating the bulb the duration of the glow was greatly diminished, and it could be instantly extinguished by the presence of an electromagnet.
The heater is cut out by an electromagnet when the glower goes into operation.
We will now consider the actual mechanical construction of the electromagnet.
A current to the electromagnet was supplied by a battery and was changed with a variable resistance.
An electromagnet was used in order to produce a magnetic field.
This consists of an electromagnet that deflects electrons away from the axis.
