Three infinitely long parallel straight current carrying wires A, B and C are kept at equal distance from each other

Q. Three infinitely long parallel straight current carrying wires A, B and C are kept at equal distance from each other as shown in the figure . The wire C experiences net force F .The net force on wire C, when the current in wire A is reversed will be

(i) Zero
(ii) F/2
(iii) F
(iv) 2F

Answer: (i) Zero

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