Answer
$3.2\times10^4\frac{V}{m}$
Work Step by Step
Assume that the plates are large enough that the electric field is uniform. Use equation 17–4b to find the magnitude of the electric field.
$$|E|=\frac{V_{ba}}{d}=\frac{220V}{0.0068m}=3.2\times10^4\frac{V}{m}$$
