Physics-
General
Easy

Question

Figure shows, in cross-section, several conductors that carry currents through the plane of the figure. The currents in the wires are I1, I2 and I3 and directions are as shown in the figure. Four paths, labeled S1 to S4 are shown. Then

  1. the line integral not stretchy contour integral stack B with rightwards arrow on top. stack d I with rightwards arrow on top for path S1 is zero    
  2. the line integral not stretchy contour integral stack B with rightwards arrow on top. stack d I with rightwards arrow on top for path S1 is mu subscript 0 end subscript I subscript 1 end subscript    
  3. the line integral not stretchy contour integral stack B with rightwards arrow on top. stack d I with rightwards arrow on top for path S3 is mu subscript 0 end subscript open parentheses I subscript 2 end subscript minus I subscript 1 end subscript close parentheses    
  4. the line integral not stretchy contour integral stack B with rightwards arrow on top. stack d I with rightwards arrow on top for path S3 is zero    

The correct answer is: the line integral not stretchy contour integral stack B with rightwards arrow on top. stack d I with rightwards arrow on top for path S1 is zero

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