A potential difference is applied across a copper wire of radius 0.5 mm. It results in a…
Physics · JEE Advanced · NTA Exams — Current Electricity
A potential difference is applied across a copper wire of radius 0.5 mm. It results in a uniform electric field of 1.5 V/m along the length of the wire. Consequently there is a current in the wire. Temperature of the wire is 60oC.Assuming each copper atom contributes one free electron .Given that density of copper is 8.9 gm/cm3 and resistivity of copper at 20oC is 1.7×10–8 ohm.m and its temperature coefficient of resistivity at 20oC is 3.9×10–3/OC . Atomic mass of copper is 63.5 . Answer the following questions.
Resistivity of copper under experimental condition is
- 4.5 × 106 Ωm
- 1.96 × 10–8 Ωm
- 3.2 × 10–8 Ωm
- 5.1 × 10–8 Ωm
Answer
(B) 1.96 × 10 –8 Ω m
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