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Find the magnetic field a height s off-axis from a

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a. We have Biot-savarts law 4π Also, d cos* θ cos 16- Angle between dL and r-7-| 9 dL × r = dLr sin (angle) cos* θ cos θ cos61 4m B= (ing-sinaj b. For infinitely long wire, 数(邻 = 40 (sing-sing)Here a =-- and θ and a = Applying, B-H

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