A mechanic dropped a bolt he needed to repair a car motor. He decided to make a simple electromagnet to try to attract the metal bolt. Which list of material would make the best electromagnet?
A.
metal rod for a core, copper wire, 9-volt battery
B.
glass rod for a core, copper wire, 9-volt battery
C.
plastic rod for a core, copper wire, 9-volt battery
D.
wooden rod for a core, copper wire, 9-volt battery
A. metal rod for a core, copper wire, 9-volt battery
Metal is a good conductor of electricity and will enhance the magnetic field created by the electromagnet. Glass, plastic, and wood are not conductive materials, so they would not be effective in creating an electromagnet.