Two parallel wires carrying equal currents in opposite directions are placed at \( x=\pm a \) pa...
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0Two parallel wires carrying equal currents in opposite directions are placed at \( x=\pm a \) parallel to \( y \)-axis with \( z=0 \). Magnetic field at origin \( O \) is \( B_{1} \) and at \( P(2 a, 0,0) \) is \( B_{2} \). Then the ratio \( B_{1} / B_{2} \) is
(A) \( -3 \)
(B) \( -\frac{1}{2} \)
(C) \( -\frac{1}{3} \)
(D) 2
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