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Q.

A 1.0cm cube of some substance has its upper face displaced by 0.5cm, by a tangental force of 0.50N fixing its lower face. Calculate the rigidity modulus of the substance.

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a

1×104N/m2

b

2×104N/m2

c

3×104N/m2

d

0.5×104N/m2

answer is A.

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Detailed Solution

η=FLAΔx=FLL2Δx=FLΔx=0.51×0.5×10−4           η=F/a2Δa/a=FaΔa=0.51×10−2×0.5×10−2   =1×104
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