iron
Its called an electromagnet
iron
Iron - use a bunch of iron nails, wrapped many times with insulated copper wire, if making your own electromagnet.
A solenoid is an electromagnet An electromagnet is a solenoid with an iron core
An iron core and copper wire (that is coated with an insulator) are used all the time to make electromagnets.
u need 2 provide more information"Which of these materials would be best to use for the core in order to make the strongest electromagnet to?"u need to provide what "these materials" are
I cannot remember for sure, but in an electromagnet, an aluminum core would not have any permeability to add to the electromagnet's strength. An electromagnet is more efficient when a thicker core is used; it generates more power. The material you use should be prone to magnetism, as in attracted by permanent magnetic apparatuses or the such. So, an aluminum bar/core (cannot be magnetized), like you stated, wouldn't be the best choice for your magnet's core.
Its called an electromagnet
iron
An electromagnet requires only two parts, a core of ferro-magnetic material and wires winding around it. The wires magnetize the core when current flows through them, and the core then creates the magnetic field which the electromagnet is intended to produce.
If the electromagnet has a core, which has become magnetized, then the core will have a residual magnetic field when the power is removed.
A ferrous core.
Electromagnets consist of wire coiled around a core. The core can be anything from air to a nail or even a pencil. Since electrons flow freely through a conductive core (like a nail), an electromagnet made with a metal core will have a larger magnetic field (and thus be stronger) than an electromagnet with a wooden core. The strength of an electromagnet is related to the number of times the wire is coiled around the core and the distance the wire covers across the core. The more coils wrapped closer together, the stronger an electromagnet will be. The amount of voltage running through the wire also plays a role in an electromagnet's strength. More voltage means more electrons moving through the wire and thus a stronger magnet.
a part of the earths structure causes it to act like an electromagnet
Iron - use a bunch of iron nails, wrapped many times with insulated copper wire, if making your own electromagnet.
No, the electromagnet is not made weaker by making the core larger. It can be made weaker by decreasing its current and/or turns of coil.
A solenoid is an electromagnet An electromagnet is a solenoid with an iron core