A) \[>g/a\]
B) \[<g/a\]
C) \[=g/a\]
D) \[>a/g\]
Correct Answer: A
Solution :
For the limiting condition upward friction force between board and block will balance the weight of the block, ie, \[F>mg\] \[\Rightarrow \] \[\mu R>mg\] \[\Rightarrow \] \[\mu (ma)>mg\] \[\Rightarrow \] \[\mu >\frac{g}{a}\]You need to login to perform this action.
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