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 to high lost of materials would make the best electromagnet? A. Plastic rod for a core copper wire and 9 volt battery b. Wooden rod for a core copper wire and 9 volt battery c. Glass rod for a core copper wire 9 volt battery d. Metal rod for core copper wire and 9 volt battery
The best option for making an electromagnet would be d. Metal rod for core, copper wire, and a 9-volt battery.
For an electromagnet to be effective, it requires a magnetic core material that can be magnetized easily. A metal rod, such as iron or steel, is the most suitable material for the core as it has high magnetic permeability. This allows it to create a stronger magnetic field when electricity flows through the wire.
Using a wooden or plastic rod as a core wouldn't be effective because they are not magnetic materials and cannot be magnetized. Glass is also not a magnetic material and would not work as a core either.