$(a)\;\large\frac{Q^{2}d}{2wl^{2} \in_{0}}\; \normalsize K\qquad(b)\;\large\frac{Q^{2}w}{2dl^{2} \in_{0}}\; \normalsize (K-1)\qquad(c)\;\large\frac{Q^{2}d}{2wl^{2} \in_{0}}\; \normalsize (K-1)\qquad(d)\;\large\frac{Q^{2}w}{2dl^{2} \in_{0}}\; \normalsize K$