16.1. Forces on Charged Objects http://www.ck12.org
(c) A material that melts at low temperature.
(d) A material that creates free electrons.
(e) None of the above.- Which of the following is a good insulator of electricity?
(a) Copper
(b) Iron
(c) Rubber
(d) Salt water
(e) None of these.
- electrons:A fundamental sub-atomic particle, meaning it cannot be broken into smaller particles. Electrons
are found in the “electron cloud” surrounding an atomic nucleus, or they may break free and exist as a free
electron. - protons: A stable, positively charged, sub-atomic particle, found in atomic nuclei in numbers equal to the
atomic number of the element. - neutral:A neutral particle, object, or system is one that has a net electric charge of zero.
- conductors:Materials through which electric charge can pass.
- insulator:Substances that block or retard the flow of electrical current or charge.
- positive ions:An atom or a group of atoms that has acquired a net positive charge by losing one or more
electrons. - negative ions:An atom or a group of atoms that has acquired a net negative charge by gaining one or more
electrons. - ions:An atom or a group of atoms that has acquired a net electric charge by gaining or losing one or more
electrons. - electroscope:An instrument used to detect the presence and sign of an electric charge by the mutual attraction
or repulsion of metal foils. - charging by conduction:Involves the contact of a charged object to a neutral object.
- charging by induction:A method used to charge an object without actually touching the object to any other
charged object.