A) 8 : 1
B) 4 : 1
C) 2 : 1
D) 1 : 1
Correct Answer: C
Solution :
[c] \[R=\frac{\rho \ell }{(\pi {{D}^{2}}/4)}\text{or }R\propto \frac{\ell }{{{D}^{2}}}.\] \[\frac{{{R}_{x}}}{{{R}_{y}}}=\frac{{{\ell }_{x}}}{D_{x}^{2}}\times \frac{D_{y}^{2}}{{{\ell }_{y}}}=\frac{{{\ell }_{y}}/2}{{{({{D}_{y}}/2)}^{2}}}\times \frac{D_{y}^{2}}{{{\ell }_{y}}}=\frac{2}{1}\]
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