A) zero
B) \[\frac{{{\mu }_{0}}}{4\pi }\]
C) \[4\,\,\pi {{\mu }_{0}}\]
D) \[\frac{4\,\,{{\mu }_{0}}}{\pi }\]
Correct Answer: A
Solution :
According to Gauss's theorem in magnetism, surface integral of magnetic field intensity over a surface (closed or open) is always zero, ie, \[\oint{\vec{B}\,.\,\overrightarrow{dA}}=0\]
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