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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Paltu Sen
Great!! you have pointed out the right thing...In question they should mention the current through which portion of the conducting medium. Here we are actually getting a volume current density. Nevertheless we consider a current flow through a circular ring (torus shaped)of the conducting medium having mean radius r and cross-sectional area A , we r getting I= emf/R. Here R= l/(sigma. A)=(2*pi*r)/(sigma*A). So, I proportional to (emf/2*pi*r) i.e. proportional to induced electric field