23_Chapter 19 HomeworkCH19 Magnetism

# 23_Chapter 19 HomeworkCH19 Magnetism - 163 Magnetism(b The...

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Magnetism 163 (b) The radius of the semicircular path is 2.00 cm. From r mv qB = , the momentum of the electron is p = mv = qBr , and the kinetic energy is ( ) ( ) ( ) ( ) ( ) 2 2 2 19 2 2 2 2 2 2 1 2 31 1.60 10 C 0.010 0 T 2.00 10 m 2 2 2 9.11 10 kg mv q B r KE mv m m × × = = = = × ( ) 16 16 1 keV 5.62 10 J 3.51 keV 1.60 10 J KE = × = × 19.53 Assume wire 1 is along the x axis and wire 2 along the y axis. (a) Choosing out of the page as the positive field direction, the field at point P is ( ) 7 0 1 2 1 2 1 2 7 4 10 T m A 5.00 A 3.00 A 2 2 0.400 m 0.300 m 5.00 10 T 0.500 T out of the page I I B B B r r π µ π π µ × = = = = × = (b) At 30.0 cm above the intersection of the wires, the field
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