To make a simple electromagnet, the girl should use a metal rod for a core, copper wire, and a 12-volt battery. The metal rod enhances the magnetic field created by the flowing current in the copper wire, making the electromagnet more effective for picking up metal objects. The other materials listed (plastic, glass, wooden rods) would not work as well, as they are not ferromagnetic and do not enhance the magnetic field.
A girl is trying to make a simple electromagnet to help her pick up a piece of metal she dropped under a car. Which list of materials would she need to make an electromagnet?
metal rod for a core, copper wire, 12-volt battery
plastic rod for a core, copper wire, 12-volt battery
glass rod for a core, copper wire, 12-volt battery
wooden rod for a core, copper wire, 12-volt battery
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