Two insulated wires perpendicular to each other in the same plane carry currents

Question

Two insulated wires perpendicular to each other in the same plane carry currents as shown in the figure (Figure 1) .
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PART A

Find the magnitude of the net magnetic field these wires produce at points P and Q if the 10.0 current is to the right.

Answer the question in the order indicated. Separate your answer with a comma




Part B

Find the magnitude of the net magnetic field these wires produce at points P and Q if the 10.0 current is to the left.

Answer the question in the order indicated. Separate your answer with a comma.

Explanation / Answer

Using B = (mu/2pi) (I/r) (2 x 10^-7) 12/.15 = 1.6 x 10^-5 T and (2 x 10^-7) 10/.08 = 2.50 x 10^-5 Adding for (a) to get 4.10 x 10^-5 (both fields out of the page) Subtracting for (b) to get 9 x 10^-6 (stronger field into page)

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