I'm not sure where a bar magnet is used, but an electromagnet is used in junkyards, and in some laboratories.
An electromagnet is used.;)
When you need a magnet you can turn on and off an electromagnet is used.
Electro Magnetic is correct
A magnet or electromagnet.
It will pick up the nails the same way a bar magnet would do!
An electromagnet is a magnet that only generates magnetic forces when electricity is running through it, basically a magnet that can be turned on and off. An electromagnetic field is the magnetic force generated when an electromagnet is used.
No. but he used an electromagnet to make discoveries about electricity.
it depends on how strong the electromagnet is. you basically choose how powerful to make an electromagnet when your designing one. one used for picking up cars at a junk yard is gonna be more powerful than one used in a kitchen appliance. and "normal magnet's" is not a good term for all other types of magnets. there are lots of different types of materials that can be magnetized, all of them are stronger or weaker then the others, all of them can also be made to different strengths, and all of them lose strength over time. the usefulness of an electromagnet is that they can be turned on and off depending on whether or not they have electricity running through them. http://en.wikipedia.org/wiki/Magnet
It depends on the amount of sunlight and the amount of electricity the panel can make if the magnet is an electromagnet, but it is possible.
An electromagnet is a type of magnet in which the magnetic field is produced by the flow of electric current. The magnetic field disappears when the current ceases. Take a look at this Wikipedia page for more information: http://en.wikipedia.org/wiki/Electromagnet
Iron.
Electromagnets are used to separate ferrous metals (containing iron) and attracted to a magnet, from non-ferrous metals (not containing iron) which are not attracted to a magnet.