Answer
$C = 5.0 \times 10^{-17} F$
Work Step by Step
We use the capacitance formula $C = \frac {k\epsilon_o A}{d}$
Where,
$k = 4.5$
$A = (0.50 \mu m)^2$
$d = 0.20 \mu m$
$\epsilon_o = 8.85 \times 10^{-12} F/m$
Substitute all the values into the equation, we solve for C
$C = \frac {( 4.5) (8.85 \times 10^{-12} F/m)}{0.20 \mu m}$
$C = 5.0 \times 10^{-17} F$
