A cubical block of mass 'm' rests on rou...

A cubical block of mass 'm' rests on rough horizontal surface. `mu` is coefficient of static friction between block and the surface. A force "mg" acting on cube at an angle " `theta`" with vertical side of cube pulls the block. If the block is to be pulled along the surface then the value of `cot (theta//2)` is

less than `mu`

greater than `mu`

equal to `mu`

`not dependent on `mu`

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