Boundary conditions for magnetic fields

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lys04
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Homework Statement
Deriving the boundary conditions for the tangential and normal components of the magnetic field at a current sheet
Relevant Equations
Ampere's law: $$\oint \vec B \cdot d \vec l = \mu_{0} I_{enc}$$
In this diagram, why is the H vector/ B vector (They differ by a constant of $$ \mu_{0} $$) pointing in the same direction on opposite sides of the current sheet?
Also, I'm a bit confused on how did they go from $$ K \Delta w = H_{1,t} \Delta w - H_{2,t} \Delta w $$ to $$ (\vec H_{1} - \vec H_{2} ) \times \hat n_{12} = \vec K $$

The former is only got to do with magnitude whereas the latter involves directions right?
Any help is appreciated!!
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  • #2
lys04 said:
The former is only got to do with magnitude whereas the latter involves directions right?
Right.
 

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