A) 4.1 m
B) 3.1 m
C) 2.1 m
D) 1.1 m
Correct Answer: D
Solution :
\[l=\frac{R\pi {{r}^{2}}}{\rho }\]\[=\frac{4.2\times 3.14\times {{(0.2\times {{10}^{-3}})}^{2}}}{48\times {{10}^{-8}}}=1.1m\]
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