What are the directions of the magnetic field | vedclass

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(B) Consider two large parallel sheets carrying surface current density $K$ in the same direction. Using the right-hand rule for a single sheet,the ma

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toward us above the plates and away from us below plates and zero between plates.

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(B) Consider two large parallel sheets carrying surface current density $K$ in the same direction. Using the right-hand rule for a single sheet,the magnetic field $B$ is parallel to the sheet and perpendicular to the current direction. For a sheet with current $K$ flowing to the right,the magnetic field points 'out' (towards us) above the sheet and 'in' (away from us) below the sheet. Let the top sheet be $S_1$ and the bottom sheet be $S_2$. Above $S_1$: Both sheets produce a field pointing 'out' (towards us). Between $S_1$ and $S_2$: $S_1$ produces a field pointing 'in' (away from us),and $S_2$ produces a field pointing 'out' (towards us). Since the magnitudes are equal,they cancel out,resulting in zero field. Below $S_2$: Both sheets produce a field pointing 'in' (away from us). Thus,the magnetic field is zero between the plates and points towards us above the plates and away from us below the plates.

What are the directions of the magnetic field between and outside a pair of two parallel large sheets carrying currents in the same directions,as illustrated in the figure?

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