Question

Which of the following phrases best describes the term "magnetic flux"?
A) the direction of the magnetic field relative to a surface
B) the amount of magnetic field that passes through a surface
C) the number of magnetic dipoles moving through a wire
D) the flow of magnetons in space
E) another name for the magnetic field

Answer 1

Answer:

B) the amount of magnetic field that passes through a surface

Explanation:

The magnetic flux is defined as the total magnetic field times the area normal to the magnetic field lines passing through it.

Mathematically:

$\phi_B=\vec{B}.\vec{A}$

where:

$\vec{A}=$ area vector directed normal to the surface

$\vec{B}=$ magnetic field vector

It is a quantity defined for the convenience of use in Faraday's Law.