The electromagnet consists of two coils, each wound on a soft iron core fixed to the poles of a strong permanent horse-shoe magnet.
The arc is produced by leading a current of about 5000 volts equatorially between the poles of an electromagnet; this produces what is practically a disk of flame, 62 ft.
An industrial electromagnet is currently being used at the junkyard.
To increase the power of your electromagnet, use a stronger battery.
When the electromagnet was connected to the battery, the paper clips started moving closer to it.
The armature of the electromagnet is normally attracted by the effect of the permanent magnet, but it is furnished with two antagonistic springs tending to throw it upwards.
These electric pulses were made to act on an electromagnet at the receiving station, which, in accordance with Page's discovery, gave out a sound of a pitch corresponding to the number of times it was magnetized or demagnetized per second.
The professor spent an entire lecture talking about how the electromagnet is used in factories today.
The ambitous third grade student decided to build an electromagnet for his science fair project.
In the receiver there is a strong electromagnet, excited by a local current, which has in its circuit two annular air gaps, across which the magnetic field is practically uniform and constant.
It consists of an electromagnet within the iron core of which is a flat disk-like cavity containing mercury, the sides of the cavity being stamped with grooves.
The current to be measured is passed through the coils of the electromagnet, then enters the mercury disk at the centre, flows through it radially in all directions, and emerges at the periphery.
It is in fact the electromagnet and spindle of a telegraph relay with a siphon in place of the tongue.
The current then passes through the coils of an electromagnet, which releases the printing mechanism.
Such a combination constitutes an electromagnet, a valuable device by means of which a magnet can be instantly made and unmade at will.