1. The problem statement, all variables and given/known data A long metal pipe of square cross-section is grounded on three sides, while the fourth (which is insulated from the rest) is maintained at constant potential ##V_0##. What is the electric field just outside the section opposite to ##V_0##? 2. Relevant equations 3. The attempt at a solution This problem can possibly be solved by solving the Laplace equation under the given boundary condition. But is there any intuitive solution to this?