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30 X X X X 10 A W X X X X 10 A 2 2.0 cm 15 V 10 cm X X X X 3 2.0 cm 10 A X X X X B = 50 mT 50 cm FIGURE EX29.35 FIGURE EX29.36 36. | What is the net force (magnitude and direction) on each wire in FIGURE EX29.36?FIGURE P2945 FIGURE P2946 46. || What are the strength and direction of the magnetic field at point P in FIGURE PEAS? 54. || What is the niagnetic field QR I strength at the center of the semicircle in FIGURE P2954? FIGURE P2954 55. || The toroid of FIGURE P2955 is a coil of wire wrapped around a doughnut-shaped ring (a torus). Toroidal magnetic elds are used to confine fusion plasmas. a. From symmetry. what must be the shape of the magnetic field in this toroid'? Explain. b. Consider a toroid with N closely spaced turns carrying current I. Use Ampre's law to nd an expression for the magnetic field strength at a point inside the torus at distance r from the axis. c. Is a toroidal magnetic field a uniform field? Explain. FIGURE P2955 FIGURE P2956 \"'D""5 ._._. .. .....-......-. 6?. II A particle of charge q and mass m moves in the uniform fields E = Eek and B = Bolt. At r= 0, the particle has velocity 30 = 120?. What is the particle's speed at a later time