Question

4. A copper wire is coiled around a soft iron
piece. The free ends of the wire are
connected to the battery, in which of the
following the strength of the electromagnet
will be more​

Answer 1

Answer:

By simply wrapping wire that has an electrical current running through it around a nail, you can make an electromagnet. When the electric current moves through a wire, it makes a magnetic field. If you coil the wire around and around, it will make the magnetic force stronger, but it will still be pretty weak.

Answer 2

Answer:

25 turns of copper wire, 8 cells