**1.**

Electric field due to the two parallel plates:

$\begin{array}{rcl}E& =& \frac{\mathbf{\sigma}}{\mathbf{2}{\mathbf{\epsilon}}_{\mathbf{0}}}\mathbf{+}\frac{\mathbf{\sigma}}{\mathbf{2}{\mathbf{\epsilon}}_{\mathbf{0}}}\\ & =& \frac{\mathbf{\sigma}}{{\mathbf{\epsilon}}_{\mathbf{0}}}\end{array}$

Two 2.70 cm times 2.70 cm plates that form a parallel-plate capacitor are charged ± 0.708 nC.

1. What is the electric field strength inside the capacitor if the spacing between the plates is 1.20 mm?

2. What is potential difference across the capacitor if the spacing between the plates is 1.20 mm?

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