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Nov25-12, 07:15 AM
Sci Advisor
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sophiecentaur's Avatar
P: 12,268
What does Div B mean?
If you draw a box (any shape) anywhere in that magnet picture above, (imagine there are more lines than have been drawn, to make it more convincing) then count the lines going in and the lines going out, you would get the same total numbers. This works even if you include the magnet in the box. Loads of the lines are within the box but they don't count as they don't go in or out but the totals in and out will still be equal.