**MAGNETIC FLUX**

The dot product of uniform magnetic field Band vector area Ā of the plane element is called magnetic flux. It is denoted by ΦB

ΦB = B . A

⇒ ΦB = BA Cos θ

Here A is a vector area of plane element whose direction is along the normal to the surface of the element and Ө is the angle between the directions of the vectors B and A.

**MAXIMUM MAGNETIC FLUX**

When the magnetic field is directed along normal to surface area (A) and parallel to vector area (Ā), Ө is zero, and the flux is maximum.

**ФB = B.A = BA Cos O°**

**= BA (1)**

**= BA (max.)**

### MINIMUM MAGNETIC FLUX

When magnetic field B is perpendicular to vector area (Ā). Then Ө = 90° and the flux is minimum (Zero).

**ΦB = B. A = BA Cos 90°**

**= BA (0)**

**= 0 (minimum).**

### MAGNETIC FLUX THROUGH CURVED SURFACE IN NON, A UNIFORM MAGNETIC FIELD

When the curved surface is placed in a uniform magnetic field, the curved surface is divided into a number of small surface elements each element assumed plane, and the flux through the whole curved surface is calculated by taking the sum of all contributions of the surface.

**ΦB = BA = N / A x m ✖️ m²**

**NmA-1 = Wb (Weber)**

### MAGNETIC FLUX DENSITY

The magnetic flux per unit area of a surface perpendicular to is called magnetic flux density. It is also called magnetic induction or magnetic field strength. It is denoted by B.

**ΦB = BA**

**B = ΦB / A**

**UNIT**

**B = ΦB / A = Wb / m² = Wbm-²**

**NA-1m-1 or Tesla**

### Related Articles:

Define and explain Ampere’s law

Sources: PHYSICSBYSYEDIES