Two cylindrical rods of uniform $$cross-sectional$$ area A and $$2A$$, having free electrons per unit volume $$2n$$ and n respectively are joined in series. A current I flows through them in steady state. Then the ratio of drift velocity of free electrons vL in left rod to drift velocity of electrons in the right rod vR is

Question

Two cylindrical rods of uniform $$cross-sectional$$ area A and $$2A$$, having free electrons per unit volume $$2n$$ and n respectively are joined in series. A current I flows through them in steady state. Then the ratio of drift velocity of free electrons vL in left rod to drift velocity of electrons in the right rod vR is

Infinity Learn · Accepted Answer

Since current I $$=$$ neAvd through both rods is same,∴    $$2neAvL$$ $$=$$  $$ne2A$$ vR or  $$vLvR=1$$

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