Electromagnetic Field Theory
Gradient of scalar field is expressed as

 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.
 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.

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Electromagnetic Field Theory
The statement which is not correct from the following:

 For a uniform long charged line with l1 c/m the electric field intensity E is given as E = ρL/(π ε0.r).
 Gauss’s law states that total electric flux through any surface is equal to the total charge enclosed by surface.
 Gauss’s static that divergence of D = ρu.
 An electric flux line is an imaginary path or a line drawn in such a way, that its direction at any point is the direction of electric field at that point.

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