Question

symbol of magnetic field and flux​

Answer 1

$B$ is the symbol of magnetic field.

and $\phi$ is the symbol of magnetic flux

Answer 2

$\huge\star\underbrace{\mathtt\red{«A} \mathtt\green{n}\mathtt\blue{s}\mathtt\purple{w}\mathtt\orange{e} \mathtt\pink{r»}}\star\:$

A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A charge that is moving in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field.

In physics, specifically electromagnetism, the magnetic flux through a surface is the surface integral of the normal component of the magnetic field B over that surface. It is usually denoted Φ or ΦB. The SI unit of magnetic flux is the weber, and the CGS unit is the maxwell.