A) \[2\,R\]
B) \[0.25\,R\]
C) \[4\,R\]
D) \[0.5\,R\]
Correct Answer: B
Solution :
\[R\propto \frac{1}{A}\Rightarrow R\propto \frac{1}{{{r}^{2}}}\propto\frac{1}{{{d}^{2}}}\] [d = diameter of wire]
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