Electromagnetic Field Theory
Which of this statement is not characteristic of a static magnetic field

 it has no sink or sources.
 it is conservative.
 it is solenoidal.
 magnetic flux lines are always closed.

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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.
 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.
 Gradient of divergence of a vector field minus the curl of the vector field.

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