Chapter 19, Problem 87PP

In another experiment, a piece of the web is suspended so that it can move freely. When either a positively charged object or a negatively charged object is brought near the web. the thread is observed to move toward the charged object. What is the best interpretation of this observation? The web is

1. A.    a negatively charged conductor.
2. B.     a positively charged conductor.
3. C.     either a positively or negatively charged conductor.
4. D.    an electrically neutral conductor.

Nerve cells and R-C circuits. The portion of a nerve cell that conducts signals is called an axon Many of the electrical properties of axons are governed by ion channels, which are protein molecules that span the axon s cell membrane When open, each ion charnel has a pore that is filled with fluid of low resistivity and connects the interior of the cell electrically to the medium outside the cell. In contrast, the lipid-rich cell membrane in which ion channels reside has very high resistivity.