This problem refers to the information given in Table 19-1.

(a) If rabbit fur is rubbed against glass, what is the sign of the charge each acquires? Explain.

(b) Repeat part (a) for the case of glass and rubber.

(c) Comparing the situations described in parts (a) and (b), in which case is the magnitude of the triboelectric charge greater? Explain.

Table 19-1

Material .................Relative charging with rubbing

Rabbit fur ......................................+ + + + + +

Glass ..............................................+ + + + +

Human hair......................................... + + + +

Nylon ..................................................+ + +

Silk .......................................................+ +

Paper .......................................................+

Cotton ......................................................-

Wood ......................................................--

Amber ....................................................---

Rubber ...................................................----

PVC .....................................................-----

Teflon ...................................................------