What is the physical significance of electric susceptibility?

Explanation

### Step-by-Step Solution:

1. **Understanding Electric Susceptibility**:
Electric susceptibility (χ) is a dimensionless quantity that indicates how easily a material can be polarized by an external electric field. It is defined as the ratio of the polarization (P) of the material to the electric field (E) applied to it. Mathematically, it can be expressed as:
\[ \chi = \frac{P}{E} \]

...