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20. (a)
Since the material is the same, the resistivity
ρ
is the same, which implies (by Eq.
2611) that the electric fields (in the various rods) are directly proportional to their
currentdensities.
Thus,
J
1
:
J
2
:
J
3
are in the ratio 2.5/4/1.5
(see Fig. 2624).
Now the
currents in the rods must be the same (they are “in series”) so
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 Spring '10
 Rebello,NobelS
 Current, Electric Fields

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