Considering the classic problem in Electrodynamics "Conducting sphere with Hemispheres at different potentials" How does one think in order to attack this problem? I didn't get it. What potential was considered in solving this problem? Was it the +V or the -V? Or both? Why is θ' considered from 0 to ∏/2? Here's the link: www.physics.hku.hk/~phys6503/Chapter3ZDW.ppt [Broken] (Slide number 16) Thank you.