A rectangular block of size \( 10 \mathrm{~cm} \times 8 \mathrm{~cm} \times 5 \mathrm{~cm} \) is...

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A rectangular block of size \( 10 \mathrm{~cm} \times 8 \mathrm{~cm} \times 5 \mathrm{~cm} \) 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
(a) Same in all the three cases (b) Maximum in \( P \) position
(c) Maximum in \( Q \) position
(d) Maximum in \( R \) position
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