Electromagnetic Field Theory
The Kirchhoff’s current law is implict in expression

 Divergence of D = ρv.
 Curl of H = J + (δ D)/(δ t).
 Divergence of B = 0.
  Surface integral of (j.ds) = 0.

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Electromagnetic Field Theory
Gradient of scalar field is expressed as

 Circulation of a vector field per unit area as the area tends to zero.
 Gradient of divergence of a vector field minus the curl of the vector field.
 Outward flux of a vector field per unit volume as the volume about the point tends to zero.
 Maximum rate of increase of scalar function at a point.

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Electromagnetic Field Theory
According to Coulomb’s law, the force of attraction or repulsion, between to electrical charges is

 inversely proportional to the square of the distance between them.
 inversely proportional to the distance between them.
 directly proportional to the distance between them.
 directly proportional to the square of the distance between them.

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