According to Rankine's formula, minimum depth of foundations, is
A. $$\frac{{\text{P}}}{{\text{w}}} \times {\left( {\frac{{1 + \sin \varphi }}{{1 - \sin \varphi }}} \right)^2}$$
B. $$\frac{{\text{P}}}{{\text{w}}} \times {\left( {\frac{{1 - \sin \varphi }}{{1 + \sin \varphi }}} \right)^2}$$
C. $$\frac{{\text{P}}}{{2{\text{w}}}} \times {\left( {\frac{{1 - \sin \varphi }}{{1 + \sin \varphi }}} \right)^2}$$
D. $$\frac{{\text{P}}}{{\text{w}}} \times \frac{{1 + \sin \varphi }}{{1 - \sin \varphi }}$$
Answer: Option B
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