Conservation of Charge Concept - wykład

Conservation of Charge Concept As our first major concept we begin with the notation that there is a thing called charge
which is conserved. It can be stationary or in motion. It can be used to probe an
electromagnetic field; it is discrete but in such small amounts as not to concern us at the
macroscopic level. The charge and its motion are characterised by parameters
DESCRIPTOR SYMBOL UNITS
Charge density per unit volume ρ Cm−3
Volume current density J Am−2
Surface current density K Am−1
Table 4.1: Important charge and current density descriptors.
such that each of the expressions in Figure 4.1 gives the amount of charge crossing the
indicated boundary per unit time, i.e. the current.
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