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A rectangular block of size 10 cm x 8 cm x 5 cm is kept in three different positions P, and R in turn as shown in the figure. In each case, the shaded area is rigidly fixed and a definite force F is applied tangentially to the opposite face to deform the block. The displacement of the upper face will be 

 

a
Same in all the three cases
b
Maximum in P position
c
Maximum in Q position
d
Maximum in R position

detailed solution

Correct option is C

η=FAlx⇒x =FAlη so it depends on lAratio which is maximum for Q

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A rectangular block of size 10 cm x 8 cm x 5 cm is kept in three different positions P, Q and R in turn as shown in the figure. In each case, the shaded area is rigidly fixed and a definite force F is applied tangentially to the opposite face to deform the block. The displacement of the upper face will be


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