$z=0$ plane separates two materials, ${}_{r2}=2,{}_{r2}=2$ for $z>0$ and ${}_{r1}=1,{}_{r1}=1$ for If there is no free surface charge and current at $z=0,(20)$

$($a$)$ If the electric field for $z<mn>0</mn>$ is vec$(E_1)=1\mathrm{.}0(\frac{V}{m})hat(x)+1\mathrm{.}0(\frac{V}{m})hat(y),$ what are the bound charge densities?

$($b$)$ If the magnetic field for $z<mn>0</mn>$ is vec$(B_1)=1\mathrm{.}0(mT)hat(x)+1\mathrm{.}0(mT)hat(z),$ what are the bound current densities? $(10)$