The rigid-jointed plane frame QRS shown in the figure is subjected to a load $P$ at the joint

R. Let the axial deformations in the frame be neglected. If the support $S$ undergoes a settlement of $\Delta=\frac{P L^{3}}{\beta E I},$ the vertical reaction at the support $S$ will become zero when $\beta$ is equal to

(A) 0.1

(B) 3.0

(C) 7.5

(D) 48.0

The rigid-jointed plane frame QRS shown in the figure is subjected to a load $P$ at the joint

R. Let the axial deformations in the frame be neglected. If the support $S$ undergoes a settlement of $\Delta=\frac{P L^{3}}{\beta E I},$ the vertical reaction at the support $S$ will become zero when $\beta$ is equal to

(A) 0.1

(B) 3.0

(C) 7.5

(D) 48.0

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