Electric Flux is a scalar quantity because it only has magnitude and does not have a direction associated with it. Scalar quantities are defined by their magnitude, which is a numerical value, but they do not have a specific direction. On the other hand, vector quantities have both magnitude and direction.

Electric flux is defined as the total number of electric field lines passing through a given surface. It is given by the equation Φ = E * A * cos(θ), where E is the electric field strength, A is the area of the surface, and θ is the angle between the electric field and the normal to the surface. Electric flux is measured in units of Nm²/C, which represents the number of electric field lines passing through a unit area.

Electric flux is a scalar quantity because it does not depend on the direction of the electric field lines. The flux passing through a surface is the same regardless of whether the field lines are entering or exiting the surface. The magnitude of the flux is determined by the strength of the electric field and the area of the surface, but it is not affected by the direction of the field lines.

In contrast, vector quantities such as torque, dipole moment, and electric field intensity have both magnitude and direction. Torque is a measure of the rotational force, dipole moment is a measure of the asymmetry of a distribution of charges, and electric field intensity is a measure of the strength and direction of the electric field at a given point. These quantities require both magnitude and direction to fully describe them, and therefore they are vector quantities.