Your lab assignment for the week is to measure the amount

Chapter 25, Problem 25.88

(choose chapter or problem)

Your lab assignment for the week is to measure the amount of charge on the 6.0-cm-diameter metal sphere of a Van de Graaff generator. To do so, youre going to use a spring with spring constant 0.65 N/m to launch a small, 1.5 g bead horizontally toward the sphere. You can reliably charge the bead to 2.5 nC, and your plan is to use a video camera to measure the beads closest approach to the edge of the sphere as you change the compression of the spring. Your data are as follows: Compression (cm) Closest approach (cm) 1.6 5.5 1.9 2.6 2.2 1.6 2.5 0.4 Use an appropriate graph of the data to determine the spheres charge in nC. You can assume that the beads motion is entirely horizontal, that the spring is so far away that the bead has no interaction with the sphere as its launched, and that the approaching bead does not alter the charge distribution on the sphere.