Gauss' Law for electric fields: The electric field due to a point charge Q is E = (Q / (4 * pi * ε₀)) * (r / |r|³), where r = and ε₀ is a constant. Show that the flux of the field across a sphere of radius a centered at the origin is ∮â‚› E · dS = (Q / ε₀). Let S be the boundary of the region between two spheres centered at the origin of radius a and b with a < b.
