Unit III - Electricity and Magnetism

I. Static Electricity - electronic charges flowing in no particular direction.

A) Electricity of the Atom

Atom: ordinarily neutral (#______ = #______)

Charge electron = ______________________

1. *** Atoms become charged by gaining or losing __________.

Mg ^{+ 2} F ^{- 1}

______ electrons ________ electrons

Why are protons never lost or gained?? _____________________

a) Ion – ___________________________:

negative charge #electrons __________ #p

positive charge #p ________ than #e

2. Charged objects lose their charge when grounded.

· Negatively charged object _________electrons when grounded to become neutral.

· Positively charged object ___________electrons when grounded to become neutral.

B. Detecting electric charges.

1. Electroscope - used to detect presence of a charged object.

Thin movable metallic leaves

a) if __________________ is present __________________

____________________________________________

b) leaves _________________________________________.

C) Transfer of charge

1. _________________ can be ________________ between

neutral objects by _______________.

Ex) hard rubber rod rubbed with ____________________

causes __________________________________ to rod.

Rubber Rod –

wool, fur -