A block of mass M is at rest on a rough ...

A block of mass M is at rest on a rough horizontal surface. The coefficient of friction between the block and the surface is `mu`. A force F = Mg acting at an angle `theta` with the vertical side of the block pulls it. In which of the following cases, the block can be pulled along the surface?

`tan theta ge mu`

`cot theta ge mu`

`tan theta//2 ge mu`

`cot theta//2 ge mu`

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