A) \[\int_{P}^{{}}{{\mathbf{\vec{B}}}}\,\mathbf{\vec{d}1}=0\]
B) \[\int_{P}^{{}}{{\mathbf{\vec{B}}}}\,\mathbf{\vec{d}1}={{\mu }_{0}}I\]
C) \[\int_{P}^{{}}{{\mathbf{\vec{B}}}}\,\mathbf{\vec{d}1}>{{\mu }_{0}}I\]
D) None of these
Correct Answer: B
Solution :
A long straight conductor carrying current \[I\] passes through 0, then by symmetry, all points of the circular path are equivalent and hence the magnitude of magnetic field should be same at these points. The circulation of magnetic field along the circle is \[\oint\limits_{{}}{\vec{B}.\overrightarrow{dl}}={{\mu }_{0}}I\] (using Amperes law )
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