A) \[3.33\times {{10}^{-9}}\,Tesla\]
B) \[1.11\times {{10}^{-4}}\,Tesla\]
C) \[3\times {{10}^{-3}}\,Tesla\]
D) \[9\times {{10}^{-2}}\,Tesla\]
Correct Answer: A
Solution :
\[B=\frac{{{\mu }_{0}}}{4\pi }\cdot \frac{2i}{r}\] Þ \[\frac{{{B}_{1}}}{{{B}_{2}}}=\frac{{{r}_{2}}}{{{r}_{1}}}\] Þ \[\frac{{{10}^{-8}}}{{{B}_{2}}}=\frac{12}{4}\] Þ \[{{B}_{2}}=3.33\times {{10}^{-9}}\,Tesla\]
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