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Nov25-12, 06:17 AM
P: 25
The divergence of a vector field tells us how many field lines goes into a volume element in relation to how many goes out.

So if div B = 0 there should be the same amount of magnetic field lines going into a volume element as are going out of it right?

But the Biot-Savart equations tells us that the magnetic field decreases by r^2 the further away you go. Could somebody help me out in pointing where I got the concept wrong?
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