2 A rectangular box with sides of length 'a,b,e' has 5 walls grounded [V=0]. Let one corner of the box be at the origin with sides at x=0, a; y=0, b; and z==0; all grounded. The side with z=o is not grounded and in fact has a potential given by Va (siHSHx/a). Find the potential for all x,y,z inside of this box