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Question

In the figure shown A and B are free to move. All the surfaces are smooth. Mass of A is m. Then:

238393_6b760c6850244fbabeef08d4b84d80bf.png

A
the acceleration of A will be more than gsinθ
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B
the acceleration of A will be less than gsinθ
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C
normal reaction on A due to B will be more than mgcosθ
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D
normal reaction on A due to B will be less than mgcosθ
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Solution

The correct option is C normal reaction on A due to B will be more than mgcosθ
The weight of mass A will act in downward direction. To get the normal force, the components of mg can be considered as shown in the image. Therefore, option C is correct.
594107_238393_ans_17a8f3522f624eeebf6a7e1a9b35f92b.png

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