Let a potential difference V be applied across a cylindrical conductor of length l and radius r. how is the drift velocity of electrons affected if
1. Length 1 of conductor is doubled ?
2. Potential difference V is doubled ?
3. Radius r is doubled ?

Explanation

To solve the problem, we need to analyze how the drift velocity of electrons (\(v_d\)) in a cylindrical conductor is affected by changes in its length, potential difference, and radius. The drift velocity can be expressed using the formula:

\[ v_d = \frac{I}{n \cdot e \cdot A} \]

where:
- \(I\) = current flowing through the conductor
...