Melissa and Cassidy built the electromagnet pictured above. They coil a copper wire around a bolt and connected the wire to both ends of a battery. When they tested it, it could pick up 3 paper clips. Their teacher challenged all groups to pick up a minimum of 10 paper clips. What could they do to increase the number of paper clips their electromagnet picks up? (1 point)
Increase the number of loops of wire around the nail
make the wire longer
remove the nail from the center of the wire
spread the loops of wire apart on the nail so they do not touch