A block kept on a rough inclined plane ,...

A block kept on a rough inclined plane ,as shown in the figure, remains at rest upto a maximum force `2N` down the inclined plane. The maximum external force up the inclined plane that does not move the block is `10N`.The coefficient of static friction between the block and the palbe is : [Taking `g=10m//s^(2)`].

`sqrt(3)/(2)`

`sqrt(3)/(4)`

`(1)/(2)`

`(2)/(3)`

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