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A copper wire of cross-sectional area 3.4 mm² and length of the wire 400 m, specific resistivity of copper $is 1 .7 \times 10^{- 8} Ω - m .$ Then the resistance of the wire is

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2 $Ω$

200 $Ω$

20 $Ω$

2 k $Ω$

answer is C.

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Detailed Solution

$Resistance R = \frac{ρl}{A} substituting the values R = \frac{1.7 \times 10^{- 8} \times 400}{3.4 \times 10^{- 6}} = 2 Ω$

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