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Easy
Question
An infinitely long wire lying along z-axis carries a current I, flowing towards positive z-direction. There is no other current, consider a circle in x-y plane with centre at (2 meter, 0, 0) and radius 1 meter. Divide the circle in small segments and let 
d denote the length of a small segment in anticlockwise direction, as shown.
The path integral 
of the total magnetic field 
along the perimeter of the given circle is,
- m0I
- 0
The correct answer is: 0
Since there is no current passing through circular path, the integral 
along the dotted circle is zero
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