A rectangular block has a square base measuring $a \times a$ and its height is $h$. It moves on a  horizontal surface in a direction perpendicular to one of the edges.  The coefficient of  friction is $\mu$. It will topple if
  • A$\mu > \frac{h}{a}$
  • B$\mu > \frac{a}{h}$
  • C$\mu > \frac{2a}{h}$
  • D$\mu > \frac{a}{2h}$
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