Basic Maths and Units and DimensionsHard
Question
In all the given cases blocks are in contact and the forces are applied as shown. All the surfaces are smooth. Then in which of the following cases, normal reaction (contact force) between the two blocks is zero :-
(i)
(ii) 
(iii) 
(iv)
(v) 
(i)
(ii) (iii) (iv)
(v) Options
A.(i), (iv)
B.(ii), (iii)
C.(iii)
D.(v)
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