A rough vertical board has an acceleration $‘a’$ so that a $2$ kg block pressing against it does not fall. The coefficient of friction between the block and the board should be
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(a) For the limiting condition upward friction force between board and block will balance the weight of the block.
i.e. $F > mg$
==> $\mu (R) > mg$
==> $\mu (ma) > mg$
==> $\mu > \frac{g}{a}$
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