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A cubical block of side 'a' is held at r...

A cubical block of side 'a' is held at rest, against a rough vertical wall by applying a force `F` acting along the centre. The mass of the block is `m`. Taking acceleration due to gravity as 'g' , determine
`(i)` The minimum coefficient of friction between the block and wall
`(ii)` The torque by normal reaction about the centre of mass

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