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?

An charge with mass m and charge q is emitted from the origin, (x,y)=(0,0). a large, flat screen is located at x=l. there is a target on the screen at y position y(h), where y(h) > 0. in this problem, you will examine two different ways that the charge might hit the target. ignore gravity in this problem. 1.assume that the charge is emitted with velocity v(0) in the positive x direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive y direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l. 2.now assume that the charge is emitted with velocity v(0) in the positive y direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive x direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l.