Magnetic Flux

Part of the Electricity and Magnetism section of Coddy's Physics journey. Lesson 48 of 51.

The magnetic flux through a loop:

$\Phi = BA\cos\theta$

θ is between B and the loop's normal. $1\ \mathrm{Wb}$ = $1\ \mathrm{T\cdot m^2}$ .

A loop in a field

Field straight through: Φ = BA. Loop along the field: Φ = 0.

Challenge

A loop of area $0.05\ \mathrm{m^2}$ sits in a $0.2\ \mathrm{T}$ field, tilted so that its normal makes $60^\circ$ with the field. What is the flux $\Phi$ through it?

Try it yourself

Solve for $Φ$

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Electricity and Magnetism

1Electric Charge and Force

Electric Charge Coulomb's Law Several Charges Recap - Charges in a Line

4Charged Conductors

The Charged Sphere Connecting Spheres Recap - Beam Between Plates

7Real Batteries

Internal Resistance The Variable Resistor Ammeters and Voltmeters Recap - Flashlight

10Magnetic Fields

Magnets and Magnetic Fields Field of a Wire Loops and Solenoids Recap - Electromagnet

2The Electric Field

The Electric Field Field of Several Charges The Uniform Field A Charge in a Uniform Field Recap - Stopping a Proton

5Capacitors

The Capacitor Combining Capacitors Changing a Capacitor Recap - Camera Flash

8Kirchhoff's Laws

The Junction Rule The Loop Rule Solving Two Loops Recap - Charging a Battery

11Magnetic Forces

Force on a Moving Charge Circles in a Field Force on a Wire Two Parallel Wires Recap - Current Balance

3Energy and Potential

Electric Potential Energy Electric Potential Field and Potential Recap - Accelerating Ions

6Current and Resistance

Current and Voltage Resistance and Ohm's Law Series and Parallel Electric Power Recap - Fairy Lights

9Capacitors in Circuits

A Capacitor in a Circuit Charging a Capacitor Discharging a Capacitor Recap - Defibrillator

12Induction

A Rod Moving in a FieldMagnetic FluxFaraday's Law Lenz's Law Recap - Generator