Q.

In the arrangement shown in the figure all surfaces are smooth. Select the correct alternative(s).
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a

for any value of θ acceleration of A and B are equal 

b

contact force between the two blocks is zero only if mA/mB = tanθ

c

normal reactions exerted by the wedge on the blocks are equal

d

contact force between the two is zero for any value of mA and mB

answer is A, C.

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