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24_Chapter 20 HomeworkCH20 Induced Voltages and Inductance

# 24_Chapter 20 HomeworkCH20 Induced Voltages and Inductance...

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198 CHAPTER 20 (b) The induced current through the axle will cause the magnetic field to exert a retarding force of magnitude r F BI = A v on the axle. The direction of this force will be opposite to that of the velocity G so as to oppose the motion of the axle. If the axle is to continue moving at constant speed, an applied force in the direction of v G and having magnitude app r F = ( ) F must be exerted on the axle. ( ) )( 0.80 0 A 10.8 N app F BI = = = A 0 T 9.0 1.50 m (c) Using the right-hand rule, observe that positive charges within the moving axle experience a magnetic force toward the rail containing point b , and negative charges experience a force directed toward the rail containing point a . Thus, the rail containing b will be positive relative to the other rail. Point is then at a higher potential than b a , and the current goes from
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