Doubt from laws of motion

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Shouldnt C also be correct here along with AB
Plz confirm!

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No option C is incorrect!

Can you plz post solution?
@Shwetanshu_2018

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Please ignore post #4 i didn’t notice that coeff of friction on the upper block is 0.1
I think option C should be correct

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@Shwetanshu_2018
So C shall be correct right?

Yes

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Yes the option C will be correct because 11N refers to the limiting case for motion between block B and C as the force will be increased there will be relative motion between the blocks.

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