The z>0 half-space is filled with an insulator with a relative dielectric constant of εr1=4, and a z<0 half-space with a

[answerhappygod]

The z>0 half-space is filled with an insulator with a
relative dielectric constant of εr1=4, and a z<0 half-space with
a relative dielectric constant of εr2=7.
Calculate the y component of the electrostatic field that will
be created by the charge density of ρs=28 [C/m2] on the sphere
shell with radius a=1 at the (5,8,11) point of the space, in
ke=1/4πεο.
Decimal separator "." is the dot character.