The document discusses several key concepts relating to electricity and magnetism: 1) Coulomb's Law describes the relationship between charged particles, with opposite charges attracting and like charges repelling with a force inversely proportional to the square of the distance. 2) Electrons are negatively charged particles while protons are positively charged. The greater the number of electrons or protons, the greater the negative or positive charge respectively. 3) Electrical forces between subatomic particles are much stronger than their gravitational forces. 4) Conductors allow electrons to move easily while insulators do not, and semiconductors can behave as either. Examples of uses of conductors, insulators, and semiconductors

1. ELECTRICITY & MAGNETISM CONCEPTUAL PHYSICS Ann C Cloutier copyright 2011

10. Parts of a microwave

11. Microwaves 10 - ²

12. Water is an electric dipole molecule > the charges are not even, water is a little bit more negative on one end Water is a polar molecule with opposite charges on opposite sides

13. The end… may the force be with you