of the electric field within the material produced by a given charge. [P3.3, P4.5]
of: a material medium
is: a property of the material that determines the magnitude of the electric field within the material produced by a given charge. [P3.3, P4.5]
appears, for example: in the equation for the magnitude of the electric field at a distance 
from a point charge 
[P4.5]
also appears, for example: in the equation for the capacitance of parallel plates of area 
separated by a distance 
and filled with the material: 
[P4.5]
is equal: if the material is a dielectric, to the permittivity of free space 
times the relative permittivity 
of the material. [P3.3, P4.5]
is equal: in a vacuum, to the permittivity of free space, 
[P4.5]
Copyright 1997, The Open University