# Magnetic field

1. Aug 6, 2009

### bodensee9

1. The problem statement, all variables and given/known data
Hello: I have the following:
The component of the magnetic field parallel to a plane of sheet is the same magnitude on both sides, but changed direction by $$\frac{1}{2}\pi$$ in going through the sheet.

I am supposed to explain what is going on. So B were to change direction, does that mean that the current is flowing along the z axis? (because B is always perpendicular to the direction of I)?

Thanks.

2. Aug 6, 2009

### kuruman

Assume the sheet is in the plane of your computer screen. What is the direction of the z-axis relative to this plane?

3. Aug 6, 2009

### bodensee9

if the sheet were the computer screen, then z would be into the page if the current were flowing to the left. I was thinking if the sheet were along the y-z plane, and the current were flowing along the y direction, then z would be pointing upwards. Does this mean that we have another field nearby that is changing its direction as it goes through the sheet? Thanks.