Question

Why does a metal comb not readily show a static charge when rubbed against wool?

Answer 1

ome materials cause or create more static electricity than others. Since static electricity is the collection of electrically charged particles on the surface of a material, various materials have a tendency of either giving up electrons and becoming positive (+) in charge or attracting electrons and becoming negative (−) in charge.

Answer 2

wool gain a positive (+) electrical charges
(Tend to give up electrons)

Answer 3

Based on the triboelelectric series (see - http://www.school-for-champions.com/science/static_materials.htm#.VQ33jI54pcQ ) plastic combs attract electrons and some metals do as well when rubbed with wool. However, combs are typically made from rubber, which are very good insulators. So when you hold it in your hand while rubbing the wool it will tend to keep most of its charge. Metals, on the other hand are good conductors and some of that charge will easily collect onto the skin and thus results in less charge on the metal comb.