A force 'F' of same magnitude is applied tangentially on upper and lower face of a cube, in opposite directions. Side of the cube is 'L'. The upper face of the cube shifts parallel to itself by a distance ' $x_{1}$ '. If another cube of same material but side '2L' is subjected to the above condition, then the displacement of the top layer is

• A

  $\frac{x_{1}}{6}$
• Correct answer
  B

  $\frac{x_{1}}{2}$
• C

  $\frac{x_{1}}{8}$
• D

  $\frac{x_{1}}{4}$

Hence, the correct answer is option: 'B'.