500
Jake has a nail, a wire, a battery, paper clips, and a bar magnet. His goal is to make an electromagnet. Which of the items mentioned will he have left over after the electromagnet is complete?
a. the nail, the wire, and the battery
b. the nail and the paper clips
c. the battery and the paper clips
d. the paper clips and the bar magnet
d. the paper clips and the bar magnet