# Magnetic Flux Formula

Magnetic flux is the product of the average magnetic field times the perpendicular area that it crosses.

Magnetic flux = Magnetic field * Area * (angle between the planar area and the magnetic flux)

The equation is:

Φ = B A cos(θ)

Where:

Φ: Magnetic Flux

A: Area

B: Magnetic field

θ: angle between a perpendicular vector to the area and the magnetic field

Magnetic Flux Formula Questions:

1) A planar surface has an area of 1 m^{2}, if a magnetic field crosses with an angle of 30° to it, and has B= 2 T. What is the magnetic flux?

Answer:

From the formula of the magnetic flux,

Φ = B A cos(θ) = 2 T * 1 m^{2} * cos(30°)

Φ = 1 T m

2) A planar surface has an area of 0.25 cm^{2}, if a magnetic field crosses perpendicular to it, and has B= 2 T. What is the magnetic flux?

Answer:

From the formula of the magnetic flux,

Φ = B A cos(θ) = 2 T * 2.5 * 10^{(-5)} m^{2} * cos(0°)

Φ = 5*10^{(-5)} T m

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