 2 Hand Carved Elegant Textile Runner Obi Display Hanger Rod Bar Finial Ends 28" US $49.99 
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How much current flows through the bar?
The two conducting rails in the drawing are tilted upwards so they make an angle of 30.0° with respect to the ground. The vertical magnetic field has a magnitude of 0.047 T. The 0.22 kg aluminum rod (length = 1.6 m) slides without friction down the rails at a constant velocity. How much current flows through the bar?
Draw a free body diagram of the bar.
Constant velocity means net force is zero.
Magnetic force helps push the rod up the ramp, and gravity tries to pull it down. So:
FbcosΘ = mgsinΘ
BilcosΘ = mgsinΘ
i = mgtanΘ/(Bl) = (0.22)(9.8)tan(30)/(0.047*1.6) = 16.6 A
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