A) B
B) 2 B
C) 4 B
D) B/2
Correct Answer: A
Solution :
\[B={{\mu }_{0}}ni\Rightarrow \frac{B}{{{B}'}}=\frac{n}{{{n}'}}\times \frac{i}{{{i}'}}=\frac{1}{(1/2)}\times \frac{1}{2}=1\Rightarrow {B}'=B\]
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