Question

what happens when you disconnect an electromagnet from a battery?

Answer 1

the current stops flowing
and
the electro magnet will remain magnetic for sometime...

Answer 2

When the battery is disconnected, the magnetic field disappears.

• Wherever there is electricity, there is an electromagnetic field surrounding it.
• When electrons flow through a wire, a magnetic field is created around the wire.
• When you wind a wire around a nail or some type of metal that is a conductor and connect the wire to the battery, the electric current creates a magnetic field around the nail.
• Electromagnets are very useful in real life, they are used in loudspeakers, clocks, telephones, doorbells, and generators.