Suppose a student rubs a Teflon rod with wool and then briefly touches it to an initially neutral aluminum rod suspended by insulating threads. What would the net charge on the Teflon rod be? What would the net charge on the aluminum rod be? After the student has touched the aluminum rod with the rubbed Teflon rod, as described above, the student then holds the Teflon rod near the aluminum rod, but does not allow them to touch. The student observes that when the rods are close enough tog
