Mod 5 Electric and Magnetic Fields in Life

Explain Electromagnetism

• The distinct characteristic of electric forces is repulsion and attraction which is dependent on the charge of the body 

• Electric forces (increase/decrease) as the square of distance between interacting charges 

• diminish

• What is the difference between electromagnetism vs gravity?

• Gravity: there is only attraction 

• Electromagnetism: there is attraction and repulsion

• Before, they thought that __ and _ were separate from each other. 

• electricity

• magnetism

____ is associated with electricity, especially ____ bodies moving ___ to each other

Magnetism, 2 bodies moving relative

Explain Maxwell’s Theory

• A logically complete and unified description of electricity, magnetism, and light

Certain kind of particles have long-range interactions which depends on an intrinsic and locally conserved property called ___

charge

Electromagnetic Waves (5) clue: think diff w/ sound wave

• Traverse waves (unlike sound waves that are longitudinal)

• Can travel through a vacuum (unlike sound waves that need a medium)

• Travel at the same speed in vacuum, c = 300,000,000 m/s

• Can transfer energy from one place to another

• Can be refracted and reflected (just like sound waves)

How do we describe electromagnetic waves?