A) B
B) 2B
C) B/2
D) B/4
Correct Answer: B
Solution :
Option [b] is correct. |
Explanation: \[\operatorname{B}\propto 1/r\] |
\[{{\operatorname{B}}_{1}}/{{B}_{2}}={{r}_{2}}/{{r}_{1}}=\frac{r/2}{r}\] \[\therefore {{\operatorname{B}}_{2}}=2{{B}_{1}}=2B\] |
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