Gravitational force is universal in nature. However when we stand near a wall we are not pulled by the wall because

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Wall has large area

The wall is at small distance

Flat surface do not exert gravitational force

The gravitational force due to wall is negligible as compared to that due to the earth

answer is D.

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Detailed Solution

Gravitational force

$\begin{aligned} F = \frac{GMm}{r^{2}} \\ F \propto M \end{aligned}$

Mass of the wall is negligible compared with mass of the earth

$∴$ Gravitational force due to wall is negligible as compared with the force due to earth

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