Current induced in the rod:
The figure shows a 21 cm long metal rod pulled along two frictionless, conducting rails at a constant speed of 3.0 m/s. The rails have negligible resistance but the rod has a resistance of 0.70 Ω.
If the applied magnetic field is 1.4 T:
a. What is the current induced in the rod?
b. What is the magnitude of the force required to keep the rod moving at a constant speed?
c. And what is the direction of this force?
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