Magnetic Flux — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Magnetic Flux Valid for a uniform magnetic field passing through a flat planar surface. Define magnetic flux as the number of magnetic field lines passing normally through a surface. Mathematically, this is the dot product of the Magnetic Field vector (B) and the Area vector (A). B = B A = |B| |A| The magnetic field B must be uniform across the area A. The area A must be a flat surface. Theta is the angle between B and the normal to the surface, not the surface plane. Taking θ as the angle between the magnetic field and the plane of the coil instead of the normal to the coil. Assuming flux is zero when the field is parallel to the plane (it is actually zero when perpendicular to the normal, i.e., parallel to the plane). Forgetting that Area is treated as a vector quantity pointing normal to the surface.