Simply, a length of wire, wrapped round to form a coil. Pass electrical current through it and it forms a magnetic field.
The field can be intensified by wrapping the coil around a soft iron core.
Soft iron, is iron that does not easily hold a permanent magnetic field, therefore when the current stops flowing, it ceases to be a magnet. It is an electromagnet. It only becomes a magnet when current flows through the coil.
A practical home experiment. use about 2 metres of bell wire (small, single core with plastic sleeving). Use a 6" nail. Wrap all the wire around the nail leaving a a few inches hanging out at each end.
Connect the wire ends to either side of a large torch battery.
You can now pick up pins. Release the wire and the pins drop.
Use a 6v lantern battery for more power.
DO NOT USE MAINS POWER. or car battery.
electric current
high-frequency lettuce
Electric current
generators produce electricity via electromagnetic induction
RADIATION
The question founders on the rocks of a chicken/egg conundrum. The presence of both an electric field and a magnetic field is required in order to produce an electromagnetic wave.
Yes if the moon fell on earth it would definetly produce a noticable magnetic field.
Coherent waves in the electromagnetic spectrum are produced by masers, for microwaves, and lasers, for light.
something !
in physics, electromagnetic radiation occurs when charged particles have forces acting on them to accelerate them. Electrons are responsible for the force needed to create electromagnetic radiation.
In a vacuum
Walking produces motion, not electromagnetic energy.
Magnets always produce an electromagnetic force- between the similar ends of magnets it is electromagnetic repulsion.
generators produce electricity via electromagnetic induction
generators produce electricity via electromagnetic induction
generators produce electricity via electromagnetic induction
None is.
no.
An electric charge.
Didn't you ever see a star? - Light is a type of electromagnetic wave.