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Question: A wire 100![](https://cdn.pureessence.tech/canvas_193.png?top_left_x=557&top_left_y=1518&width=300&h...

A wire 100 long and 2.0 mm diameter has a resistance of 0.7 ohm, the electrical resistivity of the material is

A

B

C

D

Answer

Explanation

Solution

R=ρLA⇒0.7=ρ×1227(1×10−3)2R = \frac { \rho L } { A } \Rightarrow 0.7 = \frac { \rho \times 1 } { \frac { 22 } { 7 } \left( 1 \times 10 ^ { - 3 } \right) ^ { 2 } }

ρ=2.2×10−6\rho = 2.2 \times 10 ^ { - 6 }ohm-m.