Let us apply the concepts of motional emf and Lenz\'s law to a slide-wire genera

Question

Let us apply the concepts of motional emf and Lenz's law to a slide-wire generator. Suppose the length L of the slide-wire rod in (Figure 1) is 0.10 m , its speed vis 2.5 m/s , the total resistance of the loop is 0.030 , and B is 0.60 T . Find the emf, , the induced current, the force acting on the rod, and the mechanical power needed to keep the rod moving at constant speed. If L=0.16m, v=4.1m/s, the total resistance of the loop is 0.015, and B=0.30T, find the rate at which the induced emf delivers electrical energy to the circuit.

Explanation / Answer

emf =vBl=2.5*.60*.10=.15 V

induced current=emf/(total resistance)=.15/.030=5 A

F=ilB=5*.10*.60=0.3 N

Mechanical energy=Fv=.3*2.5=.5 J

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