| A | B |
|---|
| electromagnet | a magnet consisting of a coil of wire wrapped around a core that becomes strongly magnetized when current flows through the coil producing a magnetic field |
| electromagnetic radiation | the emission and propagation of the entire range of electromagnetic spectrum including: gamma rays, x-rays, ultraviolet radiation, visible light, microwaves, and radio waves |
| electromagnetic waves | waves generated by the oscillation of a charged particle and characterized by periodic variations of electric and magnetic fields |
| entropy | a measure of randomness or disorder of a closed system |
| first law of thermodynamics | a law that states the internal energy in a system remains constant and the change in thermal energy of a system is equal to the work done on the system |
| gravitation | a force of attraction between two masses |
| gravity | the observed effect of the force of gravitation |
| magnetic | having the property of attracting iron and certain other materials by virtue of a surrounding field of force |
| magnetic field | the region where magnetic force exists around magnets or electric currents |
| second law of thermodynamics | a law that states all natural processes proceed in a preferred direction (e.g., heat flows from high temperature regions to low temperature regions) |
