ABSTRACT
The equations which describe the behaviour of electric and magnetic fields in the presence of a given charge density, https://www.w3.org/1998/Math/MathML" display="inline"> ρ ( x , t ) https://www.w3.org/1999/xlink" xlink:href="https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003436263/11a1814b-c2ab-4d89-be15-80efb520b7b3/content/math5_1.tif"/> , and current density, https://www.w3.org/1998/Math/MathML" display="inline"> J ( x , t ) https://www.w3.org/1999/xlink" xlink:href="https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003436263/11a1814b-c2ab-4d89-be15-80efb520b7b3/content/math5_2.tif"/> , are written in the following way: https://www.w3.org/1998/Math/MathML" display="block"> ∇ ⋅ E = ρ https://www.w3.org/1999/xlink" xlink:href="https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003436263/11a1814b-c2ab-4d89-be15-80efb520b7b3/content/math5_3.tif"/> https://www.w3.org/1998/Math/MathML" display="block"> ∇ ⋅ B = 0 https://www.w3.org/1999/xlink" xlink:href="https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003436263/11a1814b-c2ab-4d89-be15-80efb520b7b3/content/math5_4.tif"/> https://www.w3.org/1998/Math/MathML" display="block"> ∇ × B − 1 c ∂ E ∂ t = J https://www.w3.org/1999/xlink" xlink:href="https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003436263/11a1814b-c2ab-4d89-be15-80efb520b7b3/content/math5_5.tif"/> https://www.w3.org/1998/Math/MathML" display="block"> ∇ × E + 1 c ∂ B ∂ t = 0. https://www.w3.org/1999/xlink" xlink:href="https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003436263/11a1814b-c2ab-4d89-be15-80efb520b7b3/content/math5_6.tif"/>
