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Four very long, current carrying wires i...

Four very long, current carrying wires in the same plane intersect to form a square `40.0 cm` on each side as shown in figure. Find the magnitude and direction of the current `I` so that the magnetic field at the centre of square is zero. Wires are insulated from each other.

A

22 A

B

38 A

C

`2A`

D

18 A

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The correct Answer is:
C
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