Renaldo and Nasreen build an electromagnet by wrapping a wire around a nail and connecting the wire to both terminals of a battery. When they test the electromagnet, it can pick up 6 paper clips. Their teacher wants all groups to pick up at least 10 paper clips. What could Renaldo and Nasreen do to increase the number of paper clips their electromagnet picks up?
Question 9 options:
a. increase the number of loops of wire around the nail
b. make the wire longer
c. remove the nail from the center of the wire
d. spread the loops of wire apart on the nail so they do not touch
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