It is expressed using the Greek symbol Phi: Φ. Talking about the unit, the SI base unit of electric flux is volt-metres (V m) which is also equal to newton-metres squared per coulomb (N m 2 C -1). Besides, the base units of electric flux are kg·m 3 ·s -3 ·A -1. The SI unit of electric flux is volt meter (V·m) or equivalently newton meter squared per coulomb (N·m²/C). The value of electric flux depends on the strength of the electric field, the area of the surface, and the angle between the field and the surface. Detailed Explanation: Electric flux Electric flux is a key concept in electrostatics. An electric field → E =4x ^i −(y2 +1) ^j N/C passes through the box shown in figure. The flux of the electric field through surface ABCD and BCGF are marked as ϕ1 and ϕ11 respectively. Learn electric flux meaning, formula, SI unit, and uses in Gauss Law for Class 12, JEE, and NEET 2025. See solved examples and key differences.