Current Electricity and Electrical InstrumentEasy
Question
When 5V potential difference is applied across a wire of length 0.1 m, the drift speed of electrons is 2.5 × 10-4 ms−1. If the electron density in the wire is 8 × 1028 m-3, the resistivity of the material is close to :-
Options
A.1.6 × 10-6 Ωm
B.1.6 × 10-5 Ωm
C.1.6 × 10-8 Ωm
D.1.6 × 10-7 Ωm
Solution
V = iR = (neAVd) 
V = neVdl
ρ =
On putting values are got the answer
= 1.6 × 10-5 Ωm
V = neVdl
ρ =
On putting values are got the answer
= 1.6 × 10-5 Ωm
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