Derive an expression for the resistivity of a good conductor, in terms of the relaxation time of electrons.

Explanation

To derive the expression for the resistivity of a good conductor in terms of the relaxation time of electrons, we can follow these steps:

### Step 1: Understand Drift Velocity
The drift velocity \( V_d \) of electrons in a conductor can be expressed as:
\[ V_d = \frac{E \cdot e \cdot \tau}{m} \]
where:
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