A conductor of length L is connected to a dc source of emf `epsilon`. If this conductor is replaced by another conductor of same material and same area of cross-section but of length 3L, how will the drift velocity change?

Explanation

To solve the problem, we will analyze how the drift velocity changes when a conductor of length \( L \) is replaced by another conductor of the same material and cross-sectional area but of length \( 3L \).

### Step-by-step Solution:

1. **Understanding Drift Velocity**:
The drift velocity \( V_d \) of charge carriers in a conductor is given by the formula:
\[
V_d = \frac{I}{n \cdot e \cdot A}
...