A straight rod moves along parallel conducting rails. Therails are connected at

Question

A straight rod moves along parallel conducting rails. Therails are connected at the left side through a resistor so that therod and rails form a closed rectangular loop. A uniform fieldperpendicular to the movement of the rod exists throughout theregion. Assume the rod remains in contact with the rails as itmoves. The rod experiences no friction or air drag. The rails androd have negligible resistance. At what speed should the rod bemoving to produce the downward current in the resistor? Answer inunits of m/s.

Explanation / Answer

                The induced emf is = BLv sin                                             IR = BLv sin                                                v= IR / BL sin                                                        =( 0.25A)(3.3 ) /(1.8T)(0.74m)sin900                                                          =----------- m/s

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