Two long parallel wires, P and Q are fixed on a horizontal plane in north-south direction. Wire P is 10 cm left of Q. Wire P carries 40 A current northwards while wire Q carries 20 A current downwards. Determine the magnitude and direction of the resultant magnetic field at midpoint between the wires.
"F=\\frac{\\mu_0 I_1I_2}{2\\pi d}=1.6~mN."
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