Magnets. Among other things. You might want to be a little more specific.
A magnetic field.
ANY electrical current will be surrounded by a magnetic field. In an electromagnet, this magnetic field is often amplified by an iron core.
The copper by itself will do nothing of the sort. It will be surrounded by magnetic field lines if a current flows through it. It is the current that produces the magnetic field lines.
I am not entirely sure what you are after, but you might say that:* It is the nature of magnets to be magnetic. Or:* It is the nature of magnets to be surrounded by a magnetic field.
A common example of this is a magnet. Magnets have a magnetic field around them and can attract certain materials like iron, nickel, and cobalt due to their magnetic properties.
ANY flowing current is surrounded by a magnetic field. The coil simply makes the magnetic field stronger.
Surrounded by steel, the earth's magnetic field wouldn't penetrate.
Yes, a changing magnetic field will induce an electric field, leading to the movement of electric charges. This phenomenon is described by Faraday's law of electromagnetic induction.
Yes, a magnetic field is generated by moving electric charges. When charged particles such as electrons are in motion, they create a magnetic field that can exert forces on other charged particles. This relationship is described by the magnetic field's direction being perpendicular to both the direction of motion of the charged particles and the electric field.
A proton is surrounded by an electric field, which interacts with other charged particles. It also interacts with a magnetic field under certain conditions, such as when it moves through a magnetic field.
Any time an electrical current flows, it will automatically be surrounded by a magnetic field.
An electric current will always be surrounded by a magnetic field. The reason for the relationship is not exactly obvious; it has been explained by Albert Einstein in his paper "On the electrodynamics of moving bodies".