42. Students made an electromagnet by wrapping a wire in loops around an iron nail and attaching the wire to a battery, as shown below.
The students conducted a test to learn how the number of wire loops affected the number of paper
clips held by the electromagnet. The table below shows the results of the test.
Number of wire loops
10
20
30
40
Number of paper clips held
2.
4
7
9
Based on the information from the table, which of the following is the outcome (dependent)
variable in this experiment?
A. The number of wire loops wrapped around the nail.
B. The number of paper clips held by the electromagnet.
C. The material the nail was made of.
D. The size of the battery,