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**1. Homework Statement**

1. If two plates, 1.0 cm by 1.0 cm, with charges of −2.30 µC and +2.30 µC, what is the magnitude of the electric field at b?

+++++++++++++

.........b

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2. A uniform electric field of strength E = 4.80×10^4 N/C is observed in the region adjacent to a large, uniformly charged plate. What is the charge per unit area on the plate?

ll---->

ll---->

ll---->

ll---->

bar ll E field -->

**2. Homework Equations**

E=F/Q

E= sum kq1/(d1)^2

density = E*[tex]\epsilon[/tex]o

[tex]\epsilon[/tex] = 8.85x10^-12

**3. The Attempt at a Solution**

Not sure how to solve 1, due to the distance from the plate to B is not given.

for 2, I thought it would just be (8.85x10^-12)(4.80x10^4) = 4.25x10^-7 C/m^2