Physics - Magnetism Question with Solution | TestHub

magnetic field is $\frac{{\mu }_0\sigma \mathrm{v}}{2}$, out of the plane of the page, parallel to axis of roller.

magnetic field is ${\mu }_0\sigma$, out of the plane of the page, perpendicular to axis

electric field is $\frac{\sigma }{2{\epsilon }_0}$ perpendicular to the plane of sheet

If an electron moves parallel to V just above the sheet it will experience an upward magnetic force.