In the situatiobn shown in the figure th...

In the situatiobn shown in the figure the friction coefficient between M and the horizontal surface is `mu`. The force F is applied at an angle `theta` with vertical. The correct statements are :

If `theta gt tan^(-1)` the block cannot be pushed forward for any value of F

If `theta lt tan^(-1) mu` the block cannot be pushed forward for any value of F

As `theta` decreases the magnitude of force needed to just push the block M forward increases

None of these

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The correct Answer is:

a,c

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