A rectangular parallelopiped is measured as 1cm × 1cm × 100cm . If...

It is given that

$l = 1cm = 0 . 01m$

$A = 100cm \times 1cm = 100{cm}^{2}$

$⇒ A = 0 . 01{m}^{2}$

$ρ = 3 \times {10}^{- 7}Ωm$

Using the formula of resistance,

$R = \dfrac{ρl}{A} = \dfrac{3 \times {10}^{- 7} \times 0 . 01}{0 . 01} = 3 \times {10}^{- 7}Ω$