Write down the value of absolute permittivity of free space.

• A: 9 × 10⁹ N / C² m²
• B: 8.85 × 10⁻¹² N / C² m²
• C: 8.85 × 10⁻¹² C² / N m²
• D: 9 × 10⁹ N / C² m²

The value of absolute permittivity of free space, also known as the electric constant, is represented as:

Correct Answer

8.85 × 10⁻¹² C² / N m²

Explanation

This value is crucial in electromagnetism, as it describes how electric fields interact with the vacuum of space. It is often denoted by the symbol ε₀.

Importance in Physics

• It helps in calculating capacitance.
• It plays a role in Coulomb's law.
• It is essential for understanding electromagnetic waves.