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Two semi-infinite conducting sheets are placed at right angles to each other as shown in the figure. A point charge of $+Q$ is placed at a distance of $d$ from both sheets. The net force on the charge is $\dfrac{Q^{2}}{4\pi \in_{0}} \frac{Q}{d^{2}}$, where $K$ is given by

- $0 \\$
- $-\dfrac{1}{4} \hat{t}-\dfrac{1}{4}\hat{j} \\$
- $-\dfrac{1}{8} \hat{t}-\dfrac{1}{8}\hat{j} \\$
- $\dfrac{1-2\sqrt{2}}{8\sqrt{2}} \hat{t}+\dfrac{1-2\sqrt{2}}{8\sqrt{2}} \hat{j}$