A) \[\frac{{{\mu }_{0}}I}{4r}\]
B) \[\frac{{{\mu }_{0}}I}{2r}\]
C) zero
D) \[\frac{{{\mu }_{0}}I}{r}\]
Correct Answer: B
Solution :
The magnetic field at centre of circular coil \[B=\frac{{{\mu }_{0}}I}{2r}\]
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