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 electric flux (Φ_E) through a closed surface is proportional to the charge (Q_enc) enclosed within that surface. Mathematically, it can be expressed as:
\[ \Phi_E = \frac{Q_{enc}}{\epsilon_0} \]
where \( \Phi_E = \int \vec{E} \cdot d\vec{A} \) is the electric flux, \( \epsilon_0 \) is the permittivity of free space, and \( Q_{enc} \) is the total charge enclosed by the surface.
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