A potential difference V is applied to copper wire of diameter d and length L, what will be the effect on, the electron drift speed by doubling (a) voltage V, (b) length L, and (c ) diameter d?

Explanation

To solve the problem regarding the effect on electron drift speed when the voltage, length, and diameter of a copper wire are changed, we can follow these steps:

### Step 1: Understanding the Drift Speed Formula
The drift speed \( v_d \) of electrons in a conductor can be expressed as:
\[ v_d = \frac{e \tau}{m} \cdot E \]
where:
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