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Divergence sums the diagonal partial derivatives and measures the net outward flux per unit volume. A positive value marks a source, negative a sink, and zero an incompressible field.
Divergence
∇·F = ∂Fx/∂x + ∂Fy/∂y + ∂Fz/∂z
The divergence is 3, so the field acts as a source.
Because there are no magnetic monopoles, so magnetic field lines never begin or end — they always close on themselves.