Answer
$F = 5.95\times 10^8~N$
Work Step by Step
We can use Equation (33-32) to find the force on the Earth:
$F = \frac{I~A}{c}$
$F = \frac{I~\pi~R^2}{c}$
$F = \frac{(1400~W/m^2)~(\pi)~(6.37\times 10^6~m)^2}{3.0\times 10^8~m/s}$
$F = 5.95\times 10^8~N$
