An insulating 2D slab is given two different charge densities over its area. See figure. Find the net charge on the slab. The knowns are and a. You may assume both charge densities are uniform and constant.

1. An object has a net charge of -3.65 nC. How many electrons must you add or remove if you want to change the net charge to +1.70 nC? (10 points) 2. An insulating 2D slab is given two different charge densities over its area. See figure. Find the net a 2a charge on the slab. The knowns are o and a. You may assume both charge densities are uniform and constant. (10 points) a -+- 30 -20