6_Ch 20 College Physics ProblemCH20 Induced Voltages and Inductance

6_Ch 20 College Physics ProblemCH20 Induced Voltages and Inductance

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180 CHAPTER 20 20.6 The magnetic field generated by the current in the solenoid is () 72 0 250 41 0 T m A 1 5 . 0 A2 . 3 6 1 0 0.200 m Bn I µπ −−  ==×   T and the flux through each turn on the solenoid is 2 2 25 cos 4.00 10 m 2.36 10 T cos0 2.96 10 T m 4 B BA 2 θ π Φ=  ×  ° =× ⋅  20.7 (a) The magnetic flux through an area A may be written as ( ) cos component of perpendicular to B BA =⋅ ( A Thus, the flux through the shaded side of the cube is ) 2 23 5.0 T 2.5 10 m 3.1 10 Bx Φ= ⋅ = × = × 2 T m ± ² ³ ± ±² (b) Unlike electric field lines, magnetic field lines always form closed loops, without beginning or end. Therefore, no magnetic field lines originate or terminate within
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