A nonconducting charged slab 1 of thickness 2a has a nonuniform but symmetrical volume charge density rho0x/a, rho0>0. The sheet is centered, at x=0, on the yz-plane of a Cartesian coordinate system.
Determine the magnitude of the electric field in the region [−a < x < a] as a function of x, the distance from the yz-plane. Express your answer in terms of the variables rho0, a, x, and the permittivity constant ϵ0.

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.