State Gauss's law in electrostatics. Use this law to derive an expression for the electric field due to an infinitely long straight wire of linear charge density `lamda cm^(-1)`

Explanation

### Step-by-Step Solution

**Step 1: State Gauss's Law**
Gauss's Law in electrostatics states that the total electric flux (Φ_E) through a closed surface (S) is equal to the charge (Q) enclosed by that surface divided by the permittivity of free space (ε₀). Mathematically, it is expressed as:
\[ \Phi_E = \oint_S \mathbf{E} \cdot d\mathbf{S} = \frac{Q}{\epsilon_0} \]

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