Question

which is a better conductor, material A with resistivity 5.2*10^-8 ohm metre or material B with resistivity 1.6*10^-8 ohm metre. WHY???

Answer 1

Hi..

We know that

R = ρ (L / A)

ρ ∝1 / σ

Thus greater resistivity lower conductivity

Therefore material B is a good conductor..than material A..

Hope this helps u!!

Answer 2

[0010001111]... Hello User... [1001010101]
Here's your answer...

The formula for resistance is
$r = \frac{l}{a} \alpha$
Assume that alpha is rho. Please. It's really annoying not having the correct symbols.
Rho is resistivity.
At the same dimensions (same length and area of cross section), the material with less resistivity will have better conductance.
So material B will have better conductance, as it has less resistivity.

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