Value of $\theta$  is increased gradually from $\theta  = 0$ At $\theta=tan^{-1}(\frac{1}{2})$ both the block just start slipping. Then value of $\mu_2$ is : $(g = 10 m/s^2)$
  • A$0.5$
  • B$0.4$
  • C$0.6$
  • D$0.3$
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