On a table there is a collection of materials including an iron nail, a wooden pencil, a glass rod, a piece of copper wire, a piece of string, a 3.5-volt battery, and a 6-volt battery. Which list of materials would allow you to make the strongest electromagnet? (1 point)
• iron nail, copper wire, 3.5-volt battery
O Glass rod, copper wire, 6-volt battery
O iron nail, copper wire, 6-volt battery
O wooden pencil, string, 3.5-volt battery