1. The problem statement, all variables and given/known data Let the regions 0 < z < 0.3 m and 0.7 < z < 1.0 m be conducting slabs carrying uniform current densities of 10 A/m^2 in opposite directions. Find H (the magnetic field intensity) and different z positions. 2. Relevant equations Biot-Sarvot Law: H = ∫ (I dL X r)/ (4∏R2) Ampere's Circuital Law: ∫ HdL = I 3. The attempt at a solution I am guessing we have to apply ampere's law to each slab, in a rectangular loop. The slabs extend infinetly in the y and x axes. But I got no clue on exactly how to apply this law :( Any help would be appreciated as this my first post here. Thanks!