Chapter 23, Problem 24PCE

Predict/Explain Figure 23-37 shows two metal disks of the same size and material oscillating in and out of a region with a magnetic field. One disk is solid; the other has a series of slots. (a) Is the damping effect of eddy currents on the solid disk greater than, less than, or equal to the damping effect on the slotted disk? (b) Choose the best explanation from among the following:

1. I.                    The solid disk experiences a greater damping effect because eddy currents in It flow freely and are not interrupted by the slots.
2. II.                 The slotted disk experiences the greater damping effect because the slots allow more magnetic field to penetrate the disk.
3. III.              The disks are the same size and made of the same material, therefore, they experience the same damping effect.