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As shown in the figure, two infinitely long, identical wires are bent by 90° and placed in such a way that the segments LP and QM are along the x-axis, while segments PS and QN are parallel to the y-axis. If OP = OQ = 4cm, and the magnitude of the magnetic field at O is 10 –4 T, and the two wires carry equal currents (see figure), the magnitude of the current in each wire and the direction of the magnetic field at O will be ( μ 0 = 4 π × 10 –7 NA –2 ) : O Q L M S N P x y

1. 40 A, perpendicular into the page
2. 40 A, perpendicular out of the page
3. 20 A, perpendicular into the page
4. 40 A, perpendicular out of the page

Correct answer: 20 A, perpendicular into the page

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