Four very long, current carrying wires in the same plane intersect to form a square \( 40.0 \mat...

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Four very long, current carrying wires in the same plane intersect to form a square \( 40.0 \mathrm{~cm} \) 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.
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