41. A metal bar sliding on parallel rails a length
apart from one another is given initial velocity vo to the right. The rails are connected by a resistor of resistance R at their left. If a constant magnetic field B is directed into the page, what is the magnitude of the force on the rod?
(A) 
(B)
(C)
(D) 
(E)
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統計: A(1), B(0), C(0), D(17), E(0) #3093882
統計: A(1), B(0), C(0), D(17), E(0) #3093882