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Question
The Westergaard’s influence factor is given by _____________
Options:
A .  \(K_W=\frac{1}{π\left[1+2(\frac{r}{z})^2 \right]^\frac{3}{2}} \)
B .  \(K_W=\frac{Q}{z^2} \)
C .  \(K_W=\frac{1}{π\left[1+2(\frac{r}{z})^2 \right]^\frac{5}{2}} \frac{Q}{z^2} \)
D .  \(K_W=\frac{1}{π\left[1+2(\frac{r}{z})^2 \right]^3}\frac{Q}{z^2} \)
Answer: Option A
Answer: (a).\(K_W=\frac{1}{π\left[1+2(\frac{r}{z})^2 \right]^\frac{3}{2}} \)

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