A) 0.2
B) 0.4
C) 4.2
D) 2.4
Correct Answer: A
Solution :
The fractional change in the transverse length is proportional to the fractional change in the longitudinal length. The constant of proportionality is called Poissons ratio. In terms of Youngs modulus and rigidity modulus, it is given by \[\sigma =-\frac{\Delta d/d}{\Delta L/L}\] \[=\frac{Y}{2\eta }-1\] Given, \[Y=2.4\eta \] \[\therefore \] \[\sigma =\frac{2.4\eta }{2\eta }-1=0.2\]
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