NEET Physics Practice Exam

The value of ε⁻, known as the permittivity of free space, is a fundamental physical constant that measures the ability of a vacuum to permit electric field lines. In SI units, it is expressed as C²/(N·m²), meaning it relates the electric charge (C), force (N), and distance (m). The accepted and widely referenced value of permittivity in free space is approximately 8.85 × 10⁻¹² C²/(N·m²). This constant is essential in equations that describe electrostatic forces, such as Coulomb's law, and plays a critical role in the formulation of Maxwell's equations, which govern electromagnetism. The magnitude of ε⁻ is derived from various physical laws and measurements, and it reflects how electric fields behave in a vacuum. Understanding this value is crucial for solving problems related to capacitance, electric field strength, and potential difference in circuits. The other values provided in the options correspond to different physical constants or units entirely unrelated to the permittivity of free space. For example, one option resembles the mass of an electron, while others do not conform to common known constants in electrostatics. Therefore, the accurate and relevant choice for