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Like E in a charge-free region, where div E = 0, so also div B = 0; and where ϕB may be defined, it obeys Laplace's equation, ∇2ϕB = 0. Within a conductor carrying a current or any region in which current is distributed rather than closely confined to a thin wire, no potential ϕB can be defined.
Since the divergence of a vector describes the net flux out of an infinitesimal element, divided by the volume of the element, the velocity vector v in an incompressible fluid must obey the equation div v = 0.
The ratio of the flux to δv is called the divergence of E and is written div E. It is related to the charge density by the equation div E = ρ/ε0.
The four Maxwell equations, corresponding to the four statements above, are: (1) div D = ρ, (2) div B = 0, (3) curl E = -dB/dt, and (4) curl H = dD/dt + J.
This is expressed mathematically by div B = 0 and can be understood physically in terms of the field lines representing B. These lines always close on themselves, so that if they enter a certain volume at some point, they must also leave that volume.
The most compact way of writing these equations in the metre-kilogram-second (mks) system is in terms of the vector operators div (divergence) and curl.
Similar(42)
They still survive as such in the divs of Persian folklore, especially through the epic Shāh-nāmeh (completed 1010; "Book of Kings") by the Persian poet Ferdowsī, and in the Devil of Christian Europe.
My life hasn't been much like Adrian's, thank goodness, but his perseverance in the face of inadequacy is an inspirational to all of us provincial divs.
My life hasn't been much like Adrian's, thank goodness, but his perseverance in the face of inadequacy is an inspiration to all of us provincial divs.
I spent a month wrapping my head around divs and JavaScripts and C.S.S. classes and finally built… …this!
The man and the mark were unknown to me when I watched him deliver six middle innings of one-hit ball against the Nationals, in Game Two of the Divs, but I slowly became aware that the Fox telecasters seemed oddly unwilling to call him by his first name, and then familiarly shorten it, as is the custom.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com