You are hired by an amusement park and asked to design a ride similar to that sketched

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You are hired by an amusement park and asked to design a ride similar to that sketched in Figure Q21.16. A horizontal metal rod slides along two sloped, frictionless rails with a constant magnetic fi eld directed as shown. A rider sits on the bar and slides down along the rails. Magnetic induction leads to a force on the bar. Use Lenz’s law to show that this force is directed upward along the rails and hence keeps the rider from reaching excessive speeds. 


Sliding bar Figure Q21.16

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