PRACTICE EXERCISE $10\mathrm{.}7$

In free space, $H=0\mathrm{.}2cos(t-x)a_z\frac{A}{m}.$ Find the total power passing through:

$($a$)$ A square plate of side $10$ cm on plane $x+z=1$

$($b$)$ A circular disc of radius $5$ cm on plane $x=1.$

Answer:

$($a$)0,($b$)59\mathrm{.}22$ mW $.$