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A hollow cylinder ( $ρ = 2 .2 \times 10^{- 8} Ωm$ ) of length 3m has inner and outer diameter as 2mm and 4mm respectively, The resistance of the cylinder (in $10^{- 3} Ω$ ) is

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answer is 7.

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Detailed Solution

$R = \frac{ρl}{A} = \frac{ρl}{π (r_{2}^{2} - r_{1}^{2})} = 7.00 \times 10^{- 3} Ω$

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