Electromagnetism Basics

To prevent the flow of electric current

To increase the resistance in the wires

To concentrate the magnetic flux produced by the current outside the wires (correct)

To make the electromagnet permanent

Power source

Insulated wire (correct)

Iron core

Wires need to be insulated

The property of magnetism relies on the flow of electric current (correct)

The wire becomes permanently magnetized

The power source deactivates the magnetic field

The iron core loses its conductivity

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