?1 points sorPSE931.P026. My Notes Ask Your Teacher Consider the arrangement sho

Question

?1 points sorPSE931.P026. My Notes Ask Your Teacher Consider the arrangement shown in Figure P31.20. Assume that R-3.00 1-1.20 m, and a uniform 3.50 T magnetic field is directed into the page. At what speed should the bar be moved to produce a current of 0.500 A in the resistor? m/s Figura P31.20 Need Help? -/2 point, SnrPSF9 31 ,p027 MLFR My Nates Ask Your Teocher The figure below shows a top view of a bar that can slide on two frictionless rails. The resistor is R 5.20 , and a 2.50-T magneti field is directed perpendicularly donward , into the page. Let1.20 m a) Cakulate the applied force required to move the bar to the right et a constant speed of 1.50 m/s. N (to the right) (b) At what rate is energy delivered to the resistor? Need Help?

Explanation / Answer

8. induced emf = rate of change of magnetic flux

= B dA/dt

= B L dx/dt

= B L v

I = e/ R = B L v / R  

0.50 = (3.50) (1.20) (v) / 3

v = 0.357 m/s

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