A) 0.01 T
B) 0.02 T
C) 0.08 T
D) 0.16 T
Correct Answer: A
Solution :
\[B\,\propto \,\frac{1}{r}\Rightarrow \frac{{{B}_{1}}}{{{B}_{2}}}=\frac{{{r}_{2}}}{{{r}_{1}}}\Rightarrow \frac{0.04}{{{B}_{2}}}=\frac{40}{10}\Rightarrow {{B}_{2}}=0.01\,T\]
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