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Q.

Forces of 100 N each are applied in opposite direction on the upper and lower faces of a cube of side 20 cm. The upper face is shifted parallel to itself by 0.25 cm. If the side of the cube were 10 cm, then the displacement would be

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a

0.25 cm

b

0.75 cm

c

0.5 cm

d

1 cm

answer is B.

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Detailed Solution

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η = FlA∆l = Fll2∆l or ∆l∞1l

If l is havled, then ∆ l is doubled.

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Forces of 100 N each are applied in opposite direction on the upper and lower faces of a cube of side 20 cm. The upper face is shifted parallel to itself by 0.25 cm. If the side of the cube were 10 cm, then the displacement would be