A) \[\frac{{{\mu }_{0}}NI{{R}^{2}}}{2{{({{R}^{2}}+{{x}^{2}})}^{3/2}}}\]
B) \[\frac{{{\mu }_{0}}NI}{2R}\]
C) \[\frac{{{\mu }_{0}}NI{{R}^{2}}}{{{(R+x)}^{2}}}\]
D) Zero
Correct Answer: A
Solution :
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