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When 5 V 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 × 10 28 m –3 , the resistivity of the material is close to :

1. 1.6 × 10 –8 Ω m
2. 1.6 × 10 –7 Ω m
3. 1.6 × 10 –6 Ω m
4. 1.6 × 10 –5 Ω m

Correct answer: 1.6 × 10 –5 Ω m

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