A thin and infinitely long metal sheet of appreciable finite width b carrying current I (distributed uniformly through out of its cross section) parallel to its length is placed in an external magnetic field $$B_e$$ parallel to its plane and perpendicular to the direction of current

The thin metal sheet experiences a mechanical pressure $$P = \frac{IB_e}{b}$$ perpendicular to its face

The direction of the pressure does not change if the direction of current is reversed

In case the external magnetic field $$B_e$$ is switched off, a magnetic field $$B = \frac{\mu_0 I}{2b}$$ is observed parallel to the plane of the sheet but perpendicular to the direction current

The magnetic field produced in part (c) is $$B = \frac{2\mu_0 I}{b}$$