Solving a problem in physics section 1 paragraph 8 ele

8. The electric field created by an infinite plane charged with surface density σ = 400 nC / m2 and an infinite line thread, charged with a linear density of τ = 100 nC / m. At a distance r = 10 cm from the filament is a point charge Q = 10 nC. Determine the force F, acting on the charge and its direction, if the remaining thread and lie in one plane parallel to the plane charged.