Question

What is the relation between d and b in maxwell equation?

Answer 1

We know that for a closed surface  ∫B→⋅dA→=0 .  This implies that  ∫B→⋅dA→  for one of the two surfaces bounded by the path is equal to  −∫B→⋅dA→  for the other one, so that the two will add to zero for the whole closed surface.