Answer
$\lambda=5.0\mu \frac{C}{m}$
Work Step by Step
We know that:
$\lambda=2\pi \epsilon_{\circ}Er$
We plug in the known values to obtain:
$\lambda=2(3.1416)(8.85\times 10^{-12})(4.5\times 10^4)(2.0)$
$\lambda=5.0\times 10^{-6}=5.0\mu \frac{C}{m}$
