Magnetic Flux Formula

Magnetic Flux

Magnetic flux is defined as the total number of magnetic field lines through a given coil or area. It is the common component of the magnetic field which passes through the coil. Magnetic flux is denoted by ΦB where B is a magnetic field and its unit is Weber (Wb). The magnetic flux value depends on the magnetic field direction and it is a vector quantity.

The magnetic flux formula is given by,

Magnetic Flux Formula -1

Magnetic Flux Formula -2


B = Magnetic field,

A =  Surface area and

Θ =  Angle between the magnetic field and normal to the surface.

Solved Example

Example 1

The Dimension of a rectangular loop is 0.50m and 0.60m. B and θ are 0.02T and 45° respectively. Determine the magnetic flux through the surface.



Dimensions of rectangular loop = 0.50m and 0.60m,

B = 0.02T

θ = 45°

Magnetic flux formula is given by

ΦB = B A Cosθ

Area, A = 0.50 × 0.60

            = 0.3 m2

ΦB = 0.02 × 0.3 × Cos 45

ΦB = 0.00312 Wb

Stay tuned with BYJU’S for more such interesting articles. Also, register to “BYJU’S – The Learning App” for loads of interactive, engaging Physics-related videos and an unlimited academic assist.

Leave a Comment

Your Mobile number and Email id will not be published. Required fields are marked *