Capillary rise of water when the apparatus is taken down a mine

1. A.
   $\left(1-\frac{d}{R}\right)^{-1}$
2. B.
   $1-\frac{d}{R}$
3. C.
   $\left(1+\frac{d}{R}\right)^{-1}$
4. D.
   $1+\frac{d}{R}$

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1. A.
   $R:(R + d)$
2. B.
   $R:(R - d)$
3. C.
   $R:(R - d)^{2}$
4. D.
   $R:(R + d)^{2}$

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