A) \[R/\sqrt{2}\]
B) \[R/2\]
C) R
D) zero
Correct Answer: D
Solution :
\[B=\frac{\mu Ni{{R}^{2}}}{2{{({{R}^{2}}+{{x}^{2}})}^{3/2}}}\] \[{{B}_{\max }}\Rightarrow {{x}_{\min }}=0\]
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