What is dielectric strength ? Write the value of dielectric strength of air.

Explanation

### Step-by-Step Solution:

1. **Definition of Dielectric Strength**:
- Dielectric strength is defined as the maximum electric field that can be applied across a dielectric material without causing it to become conductive. In simpler terms, it is the maximum voltage per unit thickness that a dielectric can withstand before it experiences breakdown and allows current to flow through it.

2. **Understanding Breakdown**:
- Breakdown occurs when the electric field strength exceeds the dielectric strength of the material, causing it to lose its insulating properties. This can happen in various materials, including air, when subjected to high voltage.

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