300
Joseph set up an experiment to see how to change the strength of an electromagnet. He assembled a 9V battery, copper wire, and an iron nail. Then he wrapped the wire around the nail various numbers of times to see if that would have any effect on the number of paper clips the electromagnet would pick up.
-10 turns of wire will pick up 3 paper clips
-20 turns of wire will pick up 8 paper clips
-30 turns of wire will pick up 13 paper clips
-50 turns of wire will pick up ??? paper clips
based on the three trials, how many paper clips would you predict that the 4th electromagnet would pick up if it had 50 turns of wire around it?
a. 13
b. 18
c. 23
d. 28
What is C. 23 paper clips