Two infinitely long, thin, insulated, straight wires lie in the x‐y plane along the 
and 
‐axes respectively. Each wire carries a current 
, respectively in the positive 
‐direction and positive 
‐direction. The magnetic field will be zero at all points on the straight line:
Text Solution
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If a wire carries current along positive 
‐axis, then the magnetic field due to it along the line 
in first quadrant is upwards. If a wire carries current along positive 
‐axis, then the magnetic field due to it along the line 
in first quadrant is downwards. Along the line 
, above two values of magnetic field are equal ion magnitude but opposite in direction and thus, their resultant is zero.
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