JEE Advanced 2026 Physics question
A metal wire of cross-sectional area and length is connected across a battery of e.m.f. and internal resistance . The density, atomic mass and electrical conductivity of the metal are , and , respectively. Assuming one conduction electron per atom of the metal, the drift velocity (in ) of the electrons in the wire is:
[Take Avogadro's number as and charge of the electron as .]
Answer: (C)
Solution
**Resistance of the wire.**
R====1\ Ω .
**Current.** With the internal resistance in series,
I===1\ A.
**Free-electron density.** One electron per atom gives
n=
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