A) \[10\sqrt{10}\]
B) \[20\sqrt{10}\]
C) \[2\sqrt{10}\]
D) \[\sqrt{10}\]
Correct Answer: A
Solution :
In the given condition \[B\propto \frac{1}{{{\left( {{R}^{2}}+{{X}^{2}} \right)}^{3/2}}}\] \[\Rightarrow \] \[\frac{{{B}_{0}}}{{{B}_{3}}R}=10\sqrt{10}\]
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