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21_Ch 20 College Physics ProblemCH20 Induced Voltages and Inductance

# 21_Ch 20 College Physics ProblemCH20 Induced Voltages and Inductance

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Induced Voltages and Inductance 195 20.56 (a) ( ) ( ) 2 2 3 1 1 50.0 H 50.0 10 A 6.25 10 J 2 2 L PE LI = = × = × 10 (b) ( )( ) ( ) 2 7 3 0 1 2 3 4 10 T m A 50.0 10 A 2 2 0.250 m N kN 2.00 10 2.00 m m I I d π µ π π × × = × = A F = = 20.57 (a) To move the bar at uniform speed, the magnitude of the applied force must equal that of the magnetic force retarding the motion of the bar. Therefore, . The magnitude of the induced current is app F BI = A ( ) ( ) B t B A t B v
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