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Magnetic flux is a measure of the quantity of magnetic field lines passing through a given surface area. It is a key concept in electromagnetism and is denoted by the Greek letter Φ (phi). Mathematically, magnetic flux (Φ) through a surface is defined by the equation: \[ \Phi_B = \int \mathbf{B} \cdot d\mathbf{A} \] where: - \(\Phi_B\) is the magnetic flux.