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JEE Main & Advanced Physics Gravitation / गुरुत्वाकर्षण Question Bank Mock Test - Gravitation and Mechanical Properties of Solid

  • question_answer
    A rectangular block of size \[10cm\times 8cm\times 5cm\] 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

    Correct Answer: D

    Solution :

    [d] \[\eta =\frac{F/A}{x/L}\Rightarrow x=\frac{L}{\eta }\times \frac{F}{A}\] In \[\eta \]and F are constant, then \[x\propto \frac{L}{A}\] For maximum displacement, area at which force applied should be minimum and vertical side should be maximum. This is given in the R position of rectangular block.


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