Question

What does the expression (1/2)j.A represent? (where j=current density, a=vector potential)?

Answer 1

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here 'J' is current density and A is vector potential.

it represents radiation resistance and power density.

Answer 2

(1/2) JA represents magnetic electric density.

• Energy Density is referred as the total amount of energy in a system per unit volume.
• The amount of electric current flowing per unit cross-sectional area of a material is called current density.
• It is expresses as J.
• A vector potential is a vector field whose curl is a given vector field.
• Here A is given as the vector field.
• Half the product of the current density and vector potential is called magnetic energy density.
• Hence, 1/2) JA represents magnetic electric density.

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