A thin and infinitely long metal sheet of appreciable finite width...

Options

1. AThe thin metal sheet experiences a mechanical pressure $\mathrm{P}=\frac{I \mathrm{~B}_{\mathrm{e}}}{\mathrm{h}}$ perpendicular to its face.
2. BThe direction of the pressure does not change if the direction of current is reversed.
3. CIn case the external magnetic field $B_c$ is switched off, a magnetic field $B=\frac{\mu_0 I}{2 b}$ is observed parallel to the plane of the sheet but perpendicular to the direction current.
4. DThe magnetic field produced in part (c) is \mathrm{B}=\frac{2 \mu_0\mathrm{I}}{\mathrm{b}}