Electromagnets?

Question

I'm doing a lot of stuff on magnets at school this term and Im curious about electromagnets. I know how to make a basic one but im wondering about how you could make them even stronger. Like if you wrapped wiring around a large piece of iron and hooked the wiring up to a car battery how powerful would that be?
I need to get a better idea about how they work - like industrial magnets.
(And no I dont intend to make them myself because Im too keen on living)

Answer 1

The strength of the electromagnet depends on the number of turns, the current flowing, and the material and size of the core. More turns and larger current will give you stronger magnet at the same time better magnetic core and larger (area) size will also result to stronger electromagnet. Therefore if you use higher voltage source, it will be stronger.

Answer 2

Magnet can be even stronger by increasing the magnitude flow of current in the wire, by increasing the no of rotation of current carrying wire around the iron rod.

If you want to know how intense the magnetic field is you can calculate it by using given formula

B=uo.I/2piR
where
B=intensity of magnetic field.
uo=permiability of vaccum and it's value is 4pi x 10 ^ -7 Tm/A
I=magnitude of current flowing through the coil.
R=Radius of the coil.
This is the formula which gives the magnitude of magnetic field and hence tells how powerful the magnet is.

Answer 3

know the positive&negative side of the magnet coz electricity...

Answer 4

try this site:
http://education.jlab.org/qa/electromagnet.html