Someone's got to help me on these two. 1)Two semi-infinite grounded conducting planes meet at right angles. In the region between them, a point charge q is kept such that it is at a distance of 40cm from each of the two planes[i.e.(40,40)]. Find the position of its image charge/charges. 2)A point charge q is placed in the vicinity of a conducting sphere. Find the poition of its image charge. Just in case...An image charge will produce zero potential together with q.