17_Ch 19 College Physics ProblemCH19 Magnetism

17_Ch 19 College Physics ProblemCH19 Magnetism - 157...

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Magnetism 157 (c) At point P , 2 0 12 2 net II BB B rr µ π =− + = + ( ) 7 41 0 T m A 5.00 A 5.00 A 2 0.300 m 0.200 m T out of page net B ×⋅ 1.67 + = 19.39 The distance from each wire to point P is given by () 22 1 0.200 m 0.200 m 0.141 m 2 r =+ = At point P , the magnitude of the magnetic field produced by each of the wires is ( )( ) 7 0 0 T m A 5 . 0 0 A 2 2 0.141 m I B r 7.07 T ππ == = Carrying currents into the page, the field A produces at P is directed to the left and down at –135°, while B creates a field to the right and down at – 45°. Carrying currents toward you, C produces a field downward and to the right at – 45°, while D ’s contribution is downward and to the left. The horizontal components of these equal magnitude contributions cancel in pairs, while the vertical components all add. The total field is then 4 7.07 T sin45.0
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This note was uploaded on 12/09/2011 for the course PHYS 2020 taught by Professor Staff during the Fall '10 term at FIU.

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