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The sheet lies along the y-axis and carries a surface current density, which is labeled, J sub s (out of the page). A dotted rectangle is inscribed around the origin of the plane. The rectangle is labeled, Ampèrian contour. The length and the width of the rectangle are l and w respectively. The magnetic flux H at the top of the sheet is in the leftward direction. The magnetic flux H at the bottom of the sheet is in the rightward direction.