A) 2.4 cm
B) 0.24 cm
C) 0.024 cm
D) 24 cm
Correct Answer: C
Solution :
\[R=\rho \frac{l}{A}\Rightarrow 7=\frac{64\times {{10}^{-6}}\times 198}{\frac{22}{7}\times {{r}^{2}}}\] Þ \[r=0.024cm\]
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