3. Consider four semi-infinite parallel plane electrodes as shown below, forming a 40m x 40m square. The potential distribution in the enclosed region can be solved using the iterative solution technique. Assume a uniform grid system and that the distance between grid points is lm in both directions. If there is a circular charge distribution ps nC/m2 of radius 5m in the centre of the square region and the potential is zero at the edges, write a Matlab code to find the potential in the electrode region. Please include your Matlab code and a plot of the potential in the region. ps 3. Consider four semi-infinite parallel plane electrodes as shown below, forming a 40m x 40m square. The potential distribution in the enclosed region can be solved using the iterative solution technique. Assume a uniform grid system and that the distance between grid points is lm in both directions. If there is a circular charge distribution ps nC/m2 of radius 5m in the centre of the square region and the potential is zero at the edges, write a Matlab code to find the potential in the electrode region. Please include your Matlab code and a plot of the potential in the region. ps