Question

what is meant by electric or magnetic flux ?

Answer 1

Electric flux (φ) is defined as the number of electric lines of force passing through a surface normally. Mathematically,

Φ = E.ds

E is the electric field vector, ds is the surface area vector.

Magnetic flux (φ) is defined as the number of magnetic lines of force passing through a surface normally. Mathematically,

Φ = B.ds

B is the magnetic field vector, ds is the surface area vector.