Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It only takes a minute to sign up.
Sign up to join this community
Consider the figure above in which there is an electric current (constant) in R1 (consider it to be made of a conductor). Obviously there will be a magnetic field induced in R2 (consider it to be made of a ferromagnetic material) due to the electric current in R1. (http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/curloo.html) R3 (consider it to be made of a conductor) is an open loop as shown in the figure.
Will there be any induced voltage across AB in R3 due to the magnetic field in R2?
No, a current can only be driven by an electric field which in turn can only be generated by either charge or a time varying magnetic field. Since you say that the current is constant, the magnetic field is also constant, therefore no electrice field arises. Besides, I wouldn't say that there is a magnetic field induced in R2 (sounds strange to me). It might be amplified by R2 if R2 is made of some ferromagnetic material.
