Define the term 'mobility' of charge carriers. Write its S.I. unit.

Explanation

### Step-by-Step Solution:

1. **Definition of Mobility**:
- Mobility of charge carriers is defined as the drift velocity of the charge carriers per unit electric field. In simpler terms, it measures how quickly charge carriers (like electrons or holes) can move through a material when an electric field is applied.

2. **Formula for Mobility**:
- The formula for mobility (μ) can be expressed mathematically as:
\[
...