Q$26.$ A force $P$ applied to the midpoint $\text{'}D\text{'}$ of the link $\text{'}BC\text{'}$ as shown in Fig. Q$2$b$.$ Find the value of the couple $M$ which would cause the horizontal force transmitted by the pin $\text{'}B\text{'}$ zero. Find the components of reaction forces at the supports $\text{'}A\text{'}$ and $\text{'}C\text{'},$ respectively. Consider $P=50N$ and $R=1m.$ Draw the necessary free body diagram$($s$)$