A) 6 : 5
B) 6 : 8
C) 5 : 8
D) 1 : 2
Correct Answer: C
Solution :
Resistance \[=\rho \frac{l}{A}\] \[\therefore \] \[\frac{{{R}_{1}}}{{{R}_{2}}}=\frac{{{\rho }_{1}}}{{{\rho }_{2}}}\times \frac{{{l}_{1}}}{{{l}_{2}}}\times \frac{{{A}_{2}}}{{{A}_{1}}}=\frac{2}{3}\times \frac{3}{4}\times \frac{5}{4}=\frac{5}{8}\]
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