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2: Electric and Magnetic Fields
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- 2.1: What is a Field?
- A field is the continuum of values of a quantity as a function of position and time.
- 2.2: Electric Field Intensity
- Electric field intensity is a vector field we assign the symbol E and has units of electrical potential per distance; in SI units, volts per meter (V/m). Before offering a formal definition, it is useful to consider the broader concept of the electric field.
- 2.3: Permittivity
- Permittivity describes the effect of material in determining the electric field in response to electric charge.
- 2.4: Electric Flux Density
- 2.5: Magnetic Flux Density
- Magnetic flux density is a vector field which we identify using the symbol B and which has SI units of tesla (T). Before offering a formal definition, it is useful to consider the broader concept of the magnetic field. Magnetic fields are an intrinsic property of some materials, most notably permanent magnets.
- 2.6: Permeability
- Permeability describes the effect of material in determining the magnetic flux density. All else being equal, magnetic flux density increases in proportion to permeability.
- 2.7: Magnetic Field Intensity
- Magnetic field intensity H is an alternative description of the magnetic field in which the effect of material is factored out.
- 2.8: Electromagnetic Properties of Materials