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. 

Transcribed Image Text:

Sliding bar Figure Q21.16