# Worksheet: Charge Contained on a Plane Surface

In this worksheet, we will practice applying Gauss's law to planar regions of space, showing how the electric field varies around such regions.

**Q3: **

An aluminium foil of thickness 0.25 mm and cross-sectional side lengths of 13 cm has a charge of 27 µC that spreads on both of its 13 cm by 13 cm faces evenly. The charge on the other faces is negligible.

Find the charge density on the cube’s charged faces.

- A C/m
^{2} - B C/m
^{2} - C C/m
^{2} - D C/m
^{2} - E C/m
^{2}

Find the magnitude of the electric field 0.50 cm from the center of a cube’s charged face, assuming approximate planar symmetry.

- A N/C
- B N/C
- C N/C
- D N/C
- E N/C