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**1. Homework Statement**

A block of base ##10cm \times 10cm## and height ##15cm## is kept on an incline plane. The coefficient of friction between them is ##\sqrt { 3 } ##. The inclination of the incline plain is ##\theta##. Find the value of theta for which the block begins to topple.

**2. Homework Equations**

1)##\tau =I\alpha ##

2)For equilibrium ##\sum { \tau } =0##

**3. The Attempt at a Solution**

Itried to make free body diagram of the block.

I

As the block begins to topple the I think at that moment point A can be treated as Instantaneous Axis of rotation. Can it be?

When the block begins to topple, does the Normal force on block would shift to point A?

If so then, if I take the moment of forces acting on the block then torque of force ##N## and ##f## about A will be ##0##. But that's not correct.

How should I proceed. Sorry if I am missing something very common.

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