We have a spherical shell. We want to find the electric potential everywhere. Given charge density σ=k*sinθ, k is constant. Also it is wanted from direct integration. V=1/4piε ∫σ/r da. How can we do this, please help? I thought because it is sphere da is in the direction of r so da=r^2sinθ dθ d(phi) in spherical coordinates but I couldn't solve it.