I came across a question which was a pyq from an Indian examination.The question states; An insulting rod of length L is falling with a velocity v perpendicular to B as well as perpendicular to L. Induced emf between the two rods is? The answer to the above question as given in the answer key is zero and the explanation says that: as the rod is insulating there is no emf induced. Please explain

  • $\begingroup$ who did the rod insult? $\endgroup$
    – jim
    Commented Sep 26, 2022 at 9:04
  • 1
    $\begingroup$ Sorry for the typo $\endgroup$
    – ABDAZE
    Commented Sep 26, 2022 at 10:44

1 Answer 1


It matters not what the material of the rod is.
If the rod was a metal there would be a migration of the free/mobile electrons and in an insulator the motion of the rod through the magnetic field would produce a polarisation of the atoms/molecules.
In both cases the induced emf would be the same with the insulator being a source of emf with an extremely high source/internal resistance.


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