A) \[1.8\times {{10}^{-3}}m\]
B) \[18\times {{10}^{-3}}m\]
C) \[1.8\times {{10}^{-5}}m\]
D) \[18\times {{10}^{-7}}m\]
Correct Answer: B
Solution :
\[C=4\pi {{\varepsilon }_{0}}R\] \[R=\frac{C}{4\pi {{\varepsilon }_{0}}}=9\times {{10}^{9}}\times {{10}^{-12}}=9\times {{10}^{-3}}m\] Diameter = 2R = 2 ´ 9 ´ 10?3 = 18 ´ 10?3 m
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