Infinite wires, each carrying a current 0.5 
, are kept parallel to 
‐axis and intersecting 
‐axis at 
etc. Wires kept at positive values of 
carry current in the same direction while wires kept at negative 
carry current successively in opposite directions as shown:
A wire is kept parallel to 
‐axis and intersecting 
‐axis at 
. It carries a current‘ 
. Assuming this wire to be insulated from others current 
in it such that magnetic induction at 
is zero, is: (assume each wire to be infinitely long)
A along positive 
‐axis
A along negative 
‐axis
A along negative 
‐axis
A along positive 
‐axis
Text Solution
Verified by ExpertsA
Given that wires kept at negative 
carry current successively in opposite directions. The fields due to wires kept at 
etc. cancel each other. Due to wires kept at 
, fields are in upward direction and net field is given by:
Since 
This field is negated by field due to wire placed at 
. This wire must carry current I along positive 
‐axis such that
hence, 
A along 
‐axis.
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