Physics study guide

Study guide for physics test – Electromagnetic waves


Electrically charged objects have electric fields

Magnetic objects have magnetic field (changes to magnetic when you start moving it)

When you give something a charge you give it a field

Electromagnetic wave = alternation of electric and magnetic fields

The medium an electromagnetic wave travels through is a field

Field = altered empty space where a force could be felt by an object if present

*gravitational force field = an area of space surrounding an object where a second object would feel the force of gravity if the object was present

*electric force field = an area of space surrounding an electrically charged object where another electrically charged object would feel an electric force if present

*magnetic force field = an area of space surrounding a magnet where another magnet would feel an magnetic force if present

Electrically charged objects will exert a force on each other over a distance (so will magnets)

*magnetic force law: electrically charged objects in motion will exert an additional force beyond the electric force they exert at rest

Electric force law stated in terms of fields: an electric field surrounds every Moving charged object. Any Moving charged object that is in that field will feel the electric force due to that field.

*magnetic force law stated in terms of fields: A magnetic field surrounds every object. Any magnet in that field will feel the magnetic force due to that field


Faradays law = A changing magnetic field creates an electric field

How a generator works: when a wire loop is placed in the vicinity of a magnet and either one is moved, and electric current in the wave loop is created as long as long as the motion continues



Light

There are 6 broad categories of electromagnetic waves that make up the electromagnetic spectrum

AM radio = 1,000,000 hz
Fm radio = 100,000,000



When you get into ultraviolet rays you start getting into radiation