A) 20
B) 30
C) 40
D) 50
Correct Answer: C
Solution :
\[\Delta {{T}_{b}}=i{{K}_{b}}\cdot \,m\] \[m=\frac{1\times 1000}{250}=4\,m\] \[\therefore \] \[6.4=I\times 2\times 4\] or \[i=0.8\] For dimeristion \[i=1-\frac{\alpha }{2}\]\[\Rightarrow \] \[0.8-1=\frac{-\alpha }{2}\] or \[\alpha =0.4\,\,\Rightarrow \,\,40%\]You need to login to perform this action.
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