A) \[\frac{{{\mu }_{0}}I}{4r}\]
B) \[\frac{{{\mu }_{0}}I}{2r}\]
C) \[\frac{{{\mu }_{0}}I}{8r}\]
D) zero
Correct Answer: A
Solution :
The magnetic field at centre of half circular coil \[B=\frac{{{\mu }_{0}}I}{4r}\]
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