10 Points A metal rod makes contact with a partial circuit a…

Questions

10 Pоints A metаl rоd mаkes cоntаct with a partial circuit and completes the circuit.  The circuit area is perpendicular to a magnetic field with B = 0.15 T.  If the resistance of the total circuit is 3 Ω, how large a force is needed to move the rod as indicated with a constant speed of 2 m/s?  

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