How is an electromgnet and a bar magnet different?

Answer 1

The bar magnet is what is termed a permanent magnet . This means that it is "always on" and can be used to do things like pick up paper clips. The electromagnet is created by winding a coil of wire about a ferromagnetic core and running a direct current through that coil. Only when the current is flowing will the electromagnet be operating. With the current switched off, the magnetic field around the coil of wire disappears, and the power of the electromagnetic disappears as well.

There are some "fine points" associated with a further extension of this post, but the basic answer to the question is as written.
A bar magnet is made from magnet materials and has a magnetic field at all times. An electromagnetic is not naturally magnet and only has a magnetic field when electricity is passed through it.

Answer 2

An electromagnet is just one kind of magnet. A magnet is a material or object that produces a field (called a magnetic field) that is normally invisible but that exerts a pull on ferromagnetic materials such as iron. One magnet may also repel another magnet, or may forcefully attract it.

The difference between an electromagnet and most other kinds of magnet is that most other magnets always produce a magnetic field, but an electromagnet requires an electric field flowing through a loop or coil to produce the magnetic field. When the electric current is off, the object is no longer magnetic.

Answer 3

An electromagnet is a device produces a magnetic field from a moving electric charge. _____________________________________________________________________ All magnets are made from currents or moving charges. In a bar magnet the currents are the electrons in orbit around their nucleous. In most materials the atomic currents are oriented at random so their individual magnetic fields cancel each other out. In a bar magnet the atomic currents are all lined up so each of the atomic magnetics add up to give one large magnet. The atomic currents can be lined up, in some materials (like iron), with an electro magnet.

<P>Electromagnets make use of the fact that a current in a wire (copper or aluminum wire works fine) wire will also create a magnetic field. It is found that if you coil the wire in the shape of a spring, the ends of the coil behave just like the poles of a bar magnet. The problem is its pretty weak unless the current is very large. But if you wrap the coil around a piece of iron, the coil's magnetic field will align the atoms in the iron so the atomic magnets add to the coil's magnetism and you end up with a very strong magnet.

Answer 4

a electromagnet is bigger than a bar magnet

Answer 5

An electromagnet has electrical current witch passes through the magnet

Answer 6

An electromagnet needs a current to generate its magnetic field, the magnetic field of a bar magnet is permanent.

Both have articles in Wikipedia.org, "The World's Encyclopedia"

Answer 7

A electromagnet needs electricity to have a magnetic force. A bar magnet doesn't.

Answer 8

an electromagnet has both an electric field and a magnetic field. while a bar magnet only has a magnetic field. an electromagnet is stronger