A) \[\frac{{{\mu }_{0}}I}{2R}\]
B) \[\frac{{{\mu }_{0}}NI{{R}^{2}}}{2{{({{R}^{2}}+{{x}^{2}})}^{3/2}}}\]
C) \[\frac{{{\mu }_{0}}I}{4R}\]
D) \[\frac{{{\mu }_{0}}I}{8R}\]
Correct Answer: A
Solution :
The intensity of magnetic field at centre of circular coil \[B=\frac{{{\mu }_{0}}I}{2R}\] where R = radius of coil.
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